Browse some examples of our diagnostic tip content
Ignition Coil driver circuit in PCM
Crank Sensor fault
ASD Relay Failure
Distributor problems, no start or misfiring
Intake Gasket leaking into Valley
Timing belt jumped one or more teeth
Corrosion on connector #308
Cracked Flexplate/Flywheel
Timing chain jumped or loose, faulty cam position sensor or both.
Power steering switch leaking oil into O2 sensor harness
Carbon tracked plug wires
EGR valve hanging open
Intake manifold gaskets blown internally
Fuel Pump Cavitations causing air bubbles in the fuel rail
Valves sinking into the cylinder head
Re-route plug wires
Updated valve springs & Decarbonize valves
Oxygen sensor ground fault
Most common evap failures
Clockspring/horn voltage shorted to TPS/Cruise circuit
P0303 Fuel injector heat problem
Cam gear alignment pin broken or jumped timing belt
Wiring harness under intake melted
TPS harness shorted
Erratic TPS causing Fuel injector codes to set, erratic surge at idle
Bad battery causing stalling after startup
VSS shorting 8 or 5 volt supply to cam and crank sensor.
PCM flash update for spark knock/pinging
PCM reflash/ erroneous code P1763
Erroneous P0107, PCM reflash
Bucking/Surging at high RPM under Wide Open Throttle
Erroneous code P1398
Slightly rough idle when warm, no codes
Erroneous P0456, with no leaks found.
P1499 stored with possible overheating.
LDP vent valve with possible codes P0442, P0455, P0456
Long Crank, Hard Start
Erroneous P0116 caused by software issues.
Idle fluctuation or surge with possible misfire codes P0300 through P0304
Broken wires at Air Intake Temp sensor connector
New TPS and/or New throttle body unit
Long crank after 10-60 second run time on initial cold start.
New O2 sensor ground wire from sensor to PCM
Engine stumble or miss at 2 minute intervals
Updated exhaust valve springs & Decarbonize valves
Check engine Light on with Erroneous Misfire DTCs
CEL on with possible codes P2302, 2305, 2308, 2311, 2314, 2317
Light load misfires/ Carbon build-up on exhaust valves
Cracked cylinder wall on cylinder #8
Updated TPS
Erroneous P1594 with possible battery/charge light on intermittently.
Spark Knock. Especially with hot ambient temperatures.
Ignition Coil Update for P1320
Wiring harness breakage
P0136 O2 sensor Update
Updated TPS and Possible Transmission Control Unit
Insect nest in Evap vent hoses or components
Harness damaged by rubbing power steering pulley
Spark knock on hot re-start as key is released.
New ECM to solve spark knock, especially with high ambient temperatures.
Water entering the evap system, Water separator valve available.
Intermittent no-start or stall or run rough, especially after a hot soak.
Hesitation at cruise speed with light throttle application.
Wiring harness broken at back of engine.
ECM connector and/or O2 sensor defect.
Dirty or damaged MAF sensor.
O2 sensor replacement and PCM re-flash
ECM re-flash for P0420
P0505 stored with no drivability complaints
Stalls or idles low in gear after a cold start.
Traction control light on. P1211 and or P1212 stored
Surge at 40 to 60 MPH
P1605, TCM communication fault
Hesitation between 2000 and 3000 RPM with Manual Transmission
Lack of power on acceleration, A/T only
Dirty/damaged MAF sensor.
Accelerator stopper update for P0228 and P1228
Misfire and/or lean bank 1 or 2, injector faults
Hard start when engine is warm, possible P0340 or P0345
A/F ratio sensor codes with possible exhaust ticking noise.
ECM software update for DTC's P1031, P1051, P1148, P1168
ECM re-flash for P1274 or P1284
ECM re-flash for P0442 and/or P0456 with no leaks found.
Knock sensor or harness Causing P0325
Slow crank causing P1335 and possible hard start
Crank-no-start caused by anti-theft system.
Canister vent valve fault
Speedo Head causing P0500
EGR ports and BPT valve
MAF contamination or sluggishness.
Miscalibration of O2s
Hesitation after corner
O2 sensor failure
Plug wires cracked or burned.
EGR valve hanging open.
Intake manifold update.
Interference at ECM causing false 1336
Moisture in spark plug wells causing misfire
ECM update for false P0100
PCM update for MIL / Stall with P0446
Connector corrosion at ECM connector.
Contaminants in Evap system
False P0300
Causes for P0335
Crank no-start, or long crank after cold soak.
Erratic idle or won't idle.
MAF issues with possible P0102 or P1102
ECM problems with below freezing temperatures.
O2 sensor causing drivability and multiple possible codes.
Ignition coil resistor update.
ECM reflash for P1031, P1051, P1148, P1168
Updated Tube, ECM and Temp sensor for P0400
Updated evap pressure sensor.
Diode harness repair for P0505
P1110 VTC solenoid diagnosis
Updated torque converter for P1550
P0300 stored, but no misfires found & no customer complaints
P0505, bad IACV-AAC valve
Possible ECM fault for P0137
CKP sensor update campaign
Hesitation on light acceleration with cold engine.
ECM update for P0134 and P0171
Low power, vehicle starts off in 3rd gear
Recall campaign for cam and crank sensors
EGR valve problems
ECM software update for P1444
ECM reflash for P1278 and P1279
ECM update for P0442 and/or P0456
ECM update for P0462
ECM update for P1031 and/or P1148
EGR tube update.
Water intrusion in evap system.
ECM update for P0505
TPS update for P0731,732,733
ECM update for P1031, P1051, P1148, P1168
Water in canister from launching a boat.
Water in distributor cap
Damage to AIT Sensor harness, updated bracket.
Updated IACV-AAC valve for P0505
Updated EGR valve
Broken wire at fuel temp sensor.
Ice forming on injector tip#3
Vacuum cut valve bypass valve installed upside down.
Clutch slippage causing P0500
Rust in metal pipe damaging purge volume control valve
EGR port cleaning for P0402
ECM update for P0420
EGR tube update for P0402
Fuel tank problem
Idle surging or high with clutch depressed while moving.
Wrong speedo gear installed at factory.
Several updated parts to correct P1491.
Water dripping onto ECM
Poor ground between intake and RH cylinder head.
ECM update for idle surges with manual transmission.
P0400 or P1400 on vehicle without EGR valve.
Updated fuel injectors, ECM, and AAC valve for hard start in cold/high altitude climates
Intake casting flaw causing P0300 through P0306
Updated EGR tube for P0402
MAP/BARO switch solenoid valve fault
ECM update and O2 replacement
ECM update for P0420 and P0430
ECM update for P1441
ECM update for P0138, P0139, P0158, P0159, P1147, P1167
BPT valve hose cracked or deteriorated
TCM update to solve P0745 fault
Re-flash the TCM for P1774, P1730, P1731
ECM update for P1278, P1279, P1288, P1289
ECM update for codes P1031, P1051, P1148, P1168
Cold engine miss fire
Oil on optical sensor or bad distributor
Plugged EGR ports causing misfires
Blown intake gasket, usually cylinder #4
ECM board corrosion due to foam deterioration
NATS system failure
Mixed up sensors for P1140 or P0340
Two Stage Fuel Pump Relay
Engine Stall-Idle/Decel
Broken wire in O2 sensor harness
High Failure rate of CMP sensors
Sludge in engine causing VVT problems
Start signal fuse missing or blown
Charcoal canister coming apart
2 Repairs for P0740
P1361 and P1381 Both stored
Distributor cap contamination
Ignition faults causing P1381
Updated A/F sensor and PCM for P1164
Evap solenoid failures
False P1149
Fuel pressure regulator and vacuum hoses for P0171, P0172
Slight hesitation when accelerating slowly from a complete stop
EGR port clogging recall
Possible Moisture freezing in map sensor
Possible false misfire code set
Fuel injector/ PCM update for P0133
PCM update for P0128 and P1486
Long crank after Hot soak in winter months only
PCM update for P0128
Updated Drain joint for Evap canister
Updated air intake breather pipe
PCM reflash for P0420
PCM update for P0606
Jump-starting a vehicle can set P0606
PCM update for P0301 & P0305 or P0302 & P0306
PCM update for Ping/Spark Knock on acceleration
Hard start or long crank time
Connector fault causing P2135
Fast Idle
PCM update for P2195 and P2197
No start or starts and stalls unless throttle is partially depressed
PCM software update for false misfire codes.
Rocker hold down clip update
Engine harness rubbing on intake manifold bracket
Linear solenoid and passage contamination
PCM update for false misfire detection
PCM update for P0133
Mil on with P0740 after transmission replacement
PCM update campaign by Honda
Torque converter deteriorating causing a P0740
Fuel pump connector corrosion
Intermittent stall when coming to a stop, Vehicle does re-start
P0730, Vehicle will not move in drive
Bad solder joint in ELD
Hard start, no-start, long crank, start/stall after fill-up with gas
Camshaft endplay causing rattling and P1361/P1362
VTC solenoid stuck & PCM update
Internal PCM failure
Software update for P1440, P1679, P1446, P1449
PCM update for P1420
P1021 stored after an oil change
MIL on with P1600 or P1601
Misfire, hesitation, surge at 20 to 60 MPH
Electro-Viscous fan clutch fault
Carbon Build Up
EGR Passage Burn Through
Long crank time, fuel pressure regulator leaking
Ignition Module and/or ignition coil causing misfires
Missing PCV O Ring
Aftermarket Alarm or wiring short under dash
TCM fault for P1768 AND P1773
Flush transmission for P0740
ECM update for no-start in very cold ambient temps
EGR valve causing surging, bucking, hesitation
Fuel fill pipe threads bind the fuel cap and do not allow it to fully seat.
MAP sensor connector pins fretting
Plugged EGR ports can cause misfiring, surging, pinging, spark knock and/or high NOX readings
Low or old oil causing VTEC codes
Coil causing Tach to bounce erratically
Crank sensor wiring cut by alternator belt
Distributor, Coil, Igniter failure
PGMFI Main relay has very high failure rate
Ignition switch recall
Common causes for surging at idle
EGR hoses swapped at solenoid
Purge flow problems
Coolant switch and VTEC switch connectors switched
Ignition coil causing P0725
Plugged EGR ports causing misfires
Reduced EGR Flow
IAC valve sticking or clogged with carbon.
Crank-no-start with immobilizer key
Hesitation/Stall-Fuel Tank Baffles
Decel Stall or Long Crank Time
Harness Damage at Accumulator
Idle Surge on Cold Start 3.1
PCM Diode Causing Failed Self Test
Ignition switch fault
ECM harness damage
PCM shorted internally, can not control IAC valve
Poor body or TPS grounds.
PCM update for false misfire codes
Garage kept vehicle generates P1441 in freezing weather
Too much programmed ignition timing causing pinging below 3000RPM
Sticking power steering pressure switch causing intermittent high idle.
Fuel Tank Pressure sensor shorting 5 volt signal
Updated TCC solenoid and ground wire
Recall for purge hose cracking near exhaust
PCM software update for pinging or spark-knock
Grease on APS causing high resistance
PCM update for cold stall when shifting from park to drive.
Mass Air Flow (MAF) Sensor Contamination
Vacuum Leak on PCV hose assembly.
Wiring harness breakage near PCM
Fuel Pump Driver Modules and/or fuel pump
Fuel pump O-Ring seal update for P0440 and P0442
PCM update or Torque converter replacement
EGR valve causing surging or hesitation
Two-way valve orifice update for P0451
Faulty IAC valve setting MAP code P1129
Broken wire at Power steering switch causing idle surge
Corrosion at fuel pump connector
Loose terminal in fuse box to fuel pump
Moisture freezing in the ETCS relay
Speed sensor drive gear worn
Lean codes from oil problems
Vacuum leak at pcv hose causing lean codes
Clogged EGR ports
PCM update for false P1164
Throttle body defect causing P0122
PCM update and VTC solenoid replacement for P0341
Stumble or stall when coming to a stop
Mud in purge line and or canister
PCM update for P1163
Safety recall for shift cable
Possible software problem for P0128
Faulty trans temp sensor setting P0710
PCM update for P0420
Intake manifold seals causing lean codes and rough idle when cold
MAF causing multiple problems
EGR valve and passages causing codes
Lower intake gaskets are prone to leaking vacuum on this engine
Fuel level sensor fault, possible fuel gauge inop
One or both cats plugged causing drivability issues
O2 connectors switch after transmission or engine removal
Internal PCM failure for P1618
Possible tank pressure sensor causing P1441
Ignition coil #6 is different than 1 through 5
Incorrect spark plugs causing Ion sensing codes.
EGR valve causing P0172 and P0175
Valves too tight causing stalling or rough idle/misfires
False misfire detection by PCM
TCM update for P0740
Faulty TCM causing P1706
Harness corrosion causing P0132
Fuel cap binding when tightening and may not seal properly
PCM update for P0133 and/or P0153 O2 codes
PCM update for P1106
Ignition switch recall for stall/no-start
Warranty extension for clogged EGR ports
PCM update for P0128 and or P1486
Long crank after hot soak in cold climates
PCM update for P0301 and P0305
PCM software update for P2195 and/or P2197
PCM software reflash for misfire codes
Try flushing transmission for P0715
False misfire detection for P0304 and P0306
VTC solenoid sticking & PCM update
PCM software problems causing P0128
PCM reflash for P1122 and P1163
Bypass solenoid with sluggish response
Carbon build-up on intake valves
EGR intake port clogging with carbon
Valves tightening up and clearance reduced
Faulty Spark Detection Module
PCM software update for P0456
Hanging IAC valve causing MAP codes
PCM update for P1441 with ¾ tank
Ground wire for TCC solenoid
Ping or detonation below 3,000RPM
Ignition coil and harness update
Downstream O2 harness cut by drive shaft
Fuel tank liner deterioration
O2 heater shorting ASD relay fuse.
Shorted CKP,CMP, or VSS causing no communication with PCM
Possible blown fuse for O2 or other components
Corrosion on the transmission solenoid pressure switch and harness
PCM update for false P2096 and/or P2098
PCM update for P2302, P2305, P2308, P2311, P2314, P2317
Faulty TCM causing multiple transmission codes
PCM software update for O2 heater codes
Transmission speeds sensors causing transmission shifting problems and MIL
O2 sensor causing Hesitation, misfiring, rough running and possible MIL
Rust in fuel rail clogging injectors on returnless fuel systems
Relearn crank variance
Oil pump drive shaft seizing causing no-start or primary ignition codes
Intermittent internal coil pack failures
Flex Fuel Module fault
Fuel pump module seal leaking at tank.
Internal fuel pump sealing ring causing fuel pressure bleed off.
Bad O2 or O2 ground can cause P1762 and/or P1757
PCM update for P0443
Updated valve body cover plate.
PCM reflash for P0116, P2172, P2173
PCM update for rough idle and MIL
Updated throttle body for P2110 and/or P2118
Dirty throttle plate or dirty/wet air filter
PCM reflash for P2097 and/or P2099
Faulty PCM causing transmission codes
PCM update for EGR failure codes
Erroneous P0335 and/or P0340
PCM update for idle surge and lean codes
PCM causing intermittent drivability problems.
Gas cap strap problems
Erroneous P0460 stored
Worn distributor shaft bushings or gear.
Charcoal canister disintegration causing P0441.
Clogged converter causing no-start or low power.
PCM reflash for injector codes
Fuel injector leak down causing hard start/long crank, rough idle.
Governor pressure sensor problems.
Faulty speed sensor causing P0500 and speedo problems.
Evap hoses cracking and splitting
Shorted sensors causing No-Bus on instrument cluster and possible no-start.
Condenser fan fault and blown fuse
Faulty NVLD causing evap codes
Transmission causing stall on hard deceleration
Crank, no-start after replacing engine or crankshaft
Steady of rhythmic misfiring under a load and transmission codes stored.
Cam position sensor and/or synchronizer fault
Flex Fuel index has learned the wrong value
Ignition coil faults causing misfires on COP ignition systems
Bad DPFE sensors can cause drivability issues
Flash update for Catalyst System codes
PCM flash for test time change
PCM Flash for Catalyst System codes
Speed limiter sets codes.
Input Speed Sensor Wiring
Secondary air injection pump failure
Ignition switch
EGR valve sticking open
Splice 116 corrosion.
Anti-theft enabled on a vehicle that does not have anti-theft.
Rocker Pedestal is broken.
Bad Cam position sensor.
Ignition switch causing BUS communication issues.
Bad solder joints on instrument cluster.
Fuel pump failures
EGR valve and position sensor failures
Injector causing a hard to find misfire
DPFE sensor shorting out causing PCM to shut down
Misfire and theft/ABS/air bag/temp or other dash lights flicker
Intake gasket and IMRC shaft seals leaking.
Dirty throttle plate causing intermittent stalling or low idle
Faulty distributor or Photo cell CMP.
Timing belt jumped one or more teeth.
EGR backpressure transducer failure
Common causes for instrument cluster Inop.
Excessive carbon build-up on intake valves.
Fuel pump failing after a lengthy drive.
Leak Detection Pump failure
Timing belt jump or cam gear pin sheared
Carbon deposits holding valve open
Poor ground connections
Control valve in top of tank not closing, flooding canister after refueling vehicle.
Starter solenoid fuse blown.
Defective crank sensor causing cam sensor codes.
Broken wires in steering column near ignition lock cylinder.
GM ignition failures WITH DIS ignition.
PCM has high failure rate.
Passlock common failures
Cam sensor or magnetic interrupter failure
Carbon build-up on intake valves causing cold start issues
Poor ground splice under carpet near drivers door.
P0325 after PCM replacement.
Shorted oil pressure switch.
PCV valve missing or damaged causing codes
High failure rate of PCM causing P0341 or 341
Charcoal canister deteriorating.
Spark plug wire heat shields causing problems.
Rust or corrosion build-up on coil tower
Hidden fuses.
Instrument cluster connection.
Catalytic converter is partially or fully plugged
PCM causing surging around 40to 60 MPH
Supercharger gasket leaking vacuum.
Two crank sensors on this engine
Rough running or no start after intake gasket or head job
Injectors causing rough idle or mild misfiring at cruise.
Hesitation or lack of power, may be intermittent.
EGR hanging open slightly and intermittently
Intake gasket blown internally causing rough idle or misfire
EGR port at throttle body plugged.
EGR installed backwards causing P1406
Battery disconnect or dead battery causing low idle or stalling at stops.
Throttle stop has been tampered with, causing P0507.
CKP causing hard start with possible kickback or backfire.
PCM reflash for P0446 evap failures.
Fuel tank sending unit O-ring seal leaking from factory.
Vent valve harness chaffed or wires broken.
Fuel pressure is critical on CSFI systems.
Carbon build-up on injector poppet valves.
Injector assembly or internal fuel pressure regulator leaking.
Light misfire or shudder after injector assembly removal or replacement.
Cam lobes spun on camshaft.
Crank sensor harness shorting intermittently to exhaust or power steering bracket.
MAF sensor contamination.
PCM reflash for P1404
Wire broken to IAT sensor.
Leaking intake gaskets when cold.
High rate of timing chain faults with this engine
TCC solenoid sticking.
PCM location allows water intrusion into PCM and connector.
EGR valve and/or solenoid.
P0440 will not clear out of memory after repairs.
Rough running after head gasket replacement.
Faulty TPS/ECT sensors
Crankshaft variation learn procedure.
Fuel composition sensor faults.
Bad air pump and/or check valves
Distributor adjustment or worn drive gears.
Coil cover assembly causing misfires.
Timing chain problems.
Coil cover assembly causing misfires and no-starts.
High rate of timing chain and tensioner failure.
Extreme oil pressure keeping valves open.
Instrument panel cluster shorting communication lines.
Bad ground at bellhousing.
Cam sensor code, but vehicle does not have a cam sensor
O2 sensor problems causing hesitations, stalls, rough idle.
MAP sensor vacuum hose.
Plugged catalytic converter.
Oil pressure switch causing fuel pump issues.
CKP sensor connectors switched
CKP sensors causing intermittent stall, hard start or no-start
MAF causing hesitation on initial acceleration
Fuel tank is prone to cracking and leaking vapor at the filler neck
Plugs AND wires must be replaced when carbon tracking is found.
EGR valve causing problems
Plug wires are causing intermittent stall, especially when hot.
TPS or FTP sensor causing intermittent high idle.
Park/Neutral switch intermittently defective.
Crank sensor/ Control Module faults.
Failed input speed sensor.
Intake manifold pop-off valve leaking.
Incorrect valve timing or timing chain gears switched
Intake manifold gaskets or backfire valve leaking vacuum
AIR Check valves sticking closed
Faulty Opti-spark unit
Coil wire/Ignition coil faults.
Air pump failure
Specific problem with aftermarket plug wires.
IAC and ignition module connectors accidentally switched.
Transmission pressure control solenoid fault.
Debris plugging the 2-3 shift valve/solenoid.
Slightly higher than average injector problems
Poor connection at transmission main harness connector
TCC pulse width modulated solenoid fault
Under hood wiring harness junction box failure
Transmission fluid pressure switch.
Shorted harness causing fuel pump fuse to blow.
PCM flash update for P1441.
Wiring harness issues
PCM reflash for P0107.
Harness tension causing P0503.
Updated crank sensors.
PCM reflash for P1575.
PCM reflash for P0171, P0174
High rate of spark plug wire failures.
Wiring corrosion to EEC or Fuel pump relay.
Steering linkage pulling on crank sensor wires.
EGR ports clogged.
Inertia switched tripped.
Connector 123 rusted/corroded terminals.
PCM reflash for P0420 and/or P0430 catalyst codes.
Fuel pump wiring harness chafing at fuel tank area.
PATS system fault with bad or un-programmed key.
Crank sensor connector issues.
Broken valve springs.
Coil pack failures
Defective PCM causing O2 sensor heater circuit codes.
Bad intake gaskets and/or cracked manifolds.
Fuel pressure regulator hanging or leaking internally.
Octane adjust bar missing.
Fuel injector driver shorted in PCM.
Traction control causing severe loss of power in turns.
DPFE faults causing low EGR flow codes.
DPFE sensors and Alternators setting cam codes
EEC or computer power relay.
Relay module defective.
Faulty ignition coil packs.
Bad ECM causing rough idle/misfiring.
Balancer slipping on crankshaft.
Dirty throttle plate causing stalling or low idle.
EGR valve sticking closed
EGR position sensor gasket missing or torn.
Misfire codes after crank pulley removal or replacement.
Wrong ignition module installed.
Failed DPFE connector.
Updated harness for TPS for high idle condition.
Connector C116 power supply to relay module.
Repeated failure of relay module on the fuel pump circuit.
Coil and cam sensor connectors are switched after engine work such as head gasket replacement.
IMRC motor failure
Bad IMRC motors or stuck intake manifold runner shafts.
Defective IMRC unit.
EGR ports clogging and causing misfires.
DPFE hoses reversed
Bad or mis-adjusted camp sensor.
ECT causing rich condition and rough running
Short inside tank at fuel pump assembly.
CMP synchronizer installed 180 degrees out.
Wiring harness rubbing on AC lines.
Evap codes caused by leak at FLVV or OPR valve.
Bad Air injection pump
Fuel pump causing a surging at cruise speeds that can feel like a misfire.
Vapor management valve is a common evap failure item.
PCM reflash for P0442
Faulty ECT causing intermittent no-start or poor running.
Wiring harness chaffing at transmission housing.
Back pressure transducer hose burned through.
Distributor optical wheel causing hesitation or misfire when warm.
Air injection failures.
Poor PCM grounds.
Broken valves springs and blown head gaskets.
Blown fuse or bad air pump relay.
Air pump relay defective.
TPS causing intermittent High Idle
O2 connectors accidentally swapped.
VSS has a moderately high failure rate.
How to re-time the Ford CMP after shaft failure.
Chirping noise coming from under the hood.
Humming or vibration from the air cleaner or intake area.
Intermittent wiper, washer or brake light operation.
Intake manifold cracking and leaking coolant.
Loss of radio, power windows, etc. when transmission is put in reverse.
The cruise control is inoperative.
Noises from rear differential area.
Fuel Pump or Fuel Pump Driver Module failure.
Resetting Honda SRS lights.
PCM reflash for P0316 and/or P0191
Vacuum leak at PCV valve hose or elbow.
PCV hose leaking under upper intake manifold.
Water in bulk connecter under drivers seat causing multiple issues.
Power window, lock and mirror problems.
Squealing or screeching from under the hood.
Engine running roughly or stalling. May appear to be locked up.
Intake gaskets leaking on vehicles with plastic intake manifold.
Noise from steering column when turning.
Flex Fuel Sensor faults.
Moisture intrusion in 40 pin connector under drivers seat.
Excessive fuel pressure after engine work has been performed.
Low or no clutch pedal after servicing system.
Bad fuel rail pressure sensor.
Multiple electrical problems
ABS engages at low speeds and dry road conditions.
Rough running when cooling fans turn on.
Drive belt tensioner is bad.
Banging from the intake area.
Power steering fluid overflow/bleeding the power steering system.
PCM reflash for Lean and rich codes.
Cruise control and horn are inoperative and the air bag light is on.
Shudder or shimmy in steering after towing or repairs.
PCM reflash for spark knock
P1635, P1639 after PCM replacement.
PCM reflash for Misfire codes.
Fuel pump continues to run after engine is shut off.
Check engine light on with various codes and symptoms.
Only the third brake light illuminates.
Distributor out of synch causing P1391.
Balancer keyway broken causing cam/crank sensor phase to be incorrect.
Wiring harness problems and factory warranty extension.
The vehicle under hood wiring harness is cracking and falling apart.
Wiring harness shorting on the ignition module bracket
Rotating engine counter-clockwise can cause timing chain problems.
Camshaft dowel pins sheered.
Distributor or ignition coil failure.
TPS and MAP sensor connectors swapped accidentally.
Air intake hose broken or split.
MAF sensor faults.
Distributor cutting out when warm.
EGR ports plugged behind throttle body.
Engine fuse blows when engine is cranked.
Faulty seat belt buckle switch.
Power windows and locks inoperative.
SRS light on, Internal failure of SRS unit
Defective IAC valve causing high idle speed.
Weak coil or burned rotor button.
Throttle stop tamper or bad/out of adjustment TPS.
Defective EGR boost sensor
Harsh stumble with any but light throttle.
Leaking upper intake gaskets causing rough idle and lean codes.
Failed coolant temp sensors causing rich conditions and rough running.
Fuel gauge reads inaccurately on flex fuel vehicles.
Low tire pressure light is on.
Fuel smell inside cabin.
EGR passages behind throttle body partially plugged.
Defective IMRC actuator.
Wiring harness rubbing on engine lift bracket, firewall side.
Octane adjust bar has been removed.
Rangers & B Series Mazda have high MAF sensor failure rate
Rear Diff sensor failure.
PCM reflash for catalyst efficiency codes.
Bogs or cuts out with heavy throttle due to lack of fuel pressure.
Connector C120 problems with corrosion and poor contact.
Whining or buzzing noise coming through speakers.
Shifted flexplate causing low power or possibly even a no-start.
Spark plugs breaking off in cylinder head.
Wrong IAC valve installed.
No-start after engine swap.
Timing belt installation faults.
Timing belt, flexplate, exhaust cam gear or balancer faults.
Faulty VCT solenoid or cam gear.
Wrong part number for DPFE sensor.
New crank sensor connector wired in reverse.
Wipers stop at the top of the windshield.
Blower motor inoperative.
Check valve damage from engine overheating.
PCV hose leaking at back of engine.
Fuel rail pressure sensor or faulty fuel pump module.
Wrong PCV or cracked PCV hose.
Low coolant light on with reservoir full.
Voltage drop across inertia switch.
Engine overheating with cooling system full.
Cracked intake runner on cylinder #4
Excessive carbon causing misfire codes and rough idle.
Stall or loss of power on turns.
Updated TPS and pigtail connector
Wiring harness short near engine lift bracket near fuel rail
Cover under distributor rotor causing misfire.
Rotor button failure causing no-start or harsh cut-out, hesitation.
Distributors fail frequently on this vehicle.
Faulty coolant sensors.
Poor connection at C101, power feed for injectors.
Faulty ignition switch causing no-spark.
Incorrect PCV valve or leaking PCV vacuum hose.
Cam position sensor failure.
Harmonic balancer keyway damage causing low ignition timing.
Air flow meter is drawing down the 5 volt reference.
Weak distributor magnet
Fuel Pump Pulsator leaking
Blown throttle body base plate gasket
Partially plugged exhaust causing MAF codes
Blown ECM 1 Fuse
Blown ECM B Fuse
EGR valve sticking open
Intake gaskets leaking, usually when cold
The AC compressor clutch does not engage.
Constantly blowing fuse #29.
Brake pull to either side.
Fuel pressure spec is wrong.
Plugged catalytic converters caused by sticking fuel pressure regulator
Engine stalls when headlights are turned on.
Oil pressure gauge does not immediately rise upon startup.
Fuel gauge is inaccurate.
Four wheel drive is inoperative.
Engine cranks to slowly to start
Distributor problems causing erratic running. Runs much better with spout connector unplugged and engine at base timing.
O2 signal shorting to voltage due to corrosion.
Vehicle over-speed shut down engaging at any speed or when put into gear.
Faulty map sensor causing rich conditions.
Timing chain guides broken, chain jumped
Faulty vapor management valve
Misadjusted cam position sensor or synchronizer assembly.
One time use spark plug wires.
O2 sensors connectors accidentally switched.
Shorted O2 harness to exhaust.
Cam position sensor and synchronizer faults.
EGR tube O-ring Seal.
Crank-no-start faults.
Ignition coil harness shorting at AC line.
O2 sensor failure when hot
O2 heater driver circuit burned out in PCM.
Low coolant light is on.
Blown fuse causing multiple codes.
Valves recessed into the cylinder head.
High side AC pressure is high with little refrigerant in the system.
Damaged throttle body by cleaning.
AC blower motor has reduced efficiency.
Intake manifold gasket leaking coolant.
Defective or mis-adjusted CMP sensor/synchronizer
O2 sensor harness shorting out and blowing fuse.
Leaking intake O-ring gaskets
Fuel rail debris and regulator
Bent connecting rods due to blown intake gasket.
Repeated pinion seal failure.
Smoke coming from the steering column.
Heater hose leaking onto #4 ignition coil.
A/C condensation dripping on oxygen sensor.
EGR valve hanging slightly open
Cylinder Head Temperature sensor faults
Transmission causing hard stumble or stall
Spark plug blown out.
Wrong O2 sensor replaced.
Day time running lights inoperative.
Steering wheel is hard to turn at idle.
Do not strip the spark plug threads!
Low fuel pressure after pump replacement.
Do not machine 4.6L and 5.4L cylinder heads.
Water intrusion into GEM module.
Performance chip causing P0605
Shorted harness on top of engine.
Correct spark plugs are crucial.
Erratic gauges and other interior accessories.
Front differential will not engage.
Grinding from front differential.
Overheating or fluctuating temperature after water pump replacement.
Vehicle will not start after replacing fuel pump.
AC inoperative after condenser replacement.
Bogs or holds back on acceleration.
Snap or clunk from front differential assembly.
Repeat oil leak at the timing cover.
Cannot bleed rear brakes after replacement of master cylinder or ABS control components.
Weak ignition coil
Poor grounds causing no start,hard start, or kick-back.
Suspension noise that is difficult to locate.
Thump from back of vehicle when stopping.
Air bag light comes on after re-installing air bag.
Air bag codes B0051, B0053, or B1051, B1053, or B1151, B1153.
Coolant temperature sensor removal.
Multiple issues including MIL or ABS lights illuminated, stalling or other electrical issues.
Tire inflation warning false activation.
Blower motor does not work on one or more speed.
SIR system codes will not clear.
ABS system setting code C1238.
ABS system setting code C1241.
ABS system setting code C1242.
Pass through connector burned or corroded.
ABS activates at low speeds.
The dome light stays on all the time.
The turn signal flasher continues to operate after the turn signal switch is turned off.
ABS light comes on at low speeds.
Brake lights do not work.
Temperature gauge is reading hot.
All lights at the front of the vehicle are inoperative.
P0125 is an A/F or O2 sensor code, not coolant temp
Low coolant light comes on when the level is full.
Wrong Bank sensor replaced.
Timing belt jumped or installed improperly.
Engine overheats.
Bad ignition coil in distributor.
IMRC linkage rods or vacuum motors defective
Vacuum switching valve causing no or low EGR
Vacuum switching valve causing too much EGR flow.
Failing ECT sensor
EGR valve causing stalling when coming to a stop.
Bad idle switch or carboned throttle plate.
Shorted Capacitor in distributor
A/F Ratio sensors are not oxygen sensors.
Idle speed control motor not working when cold
Daytime running lamp indicator on dash is flashing.
Engine or transmission whine at 2800-3200 RPM.
Timing chain rattle after repairs.
Blows fuel pump or ECM B fuse.
Shorted wiring in the trunk
Multiple causes for P1300, P1310
Evap hoses accidentally swapped.
Hose pulled off canister closed valve
ABS codes C1246 and C1286.
The 4WD fuse is blowing or the front axle will not engage.
AC does not operate when the button is pushed.
A/F ratio sensor causing lean codes
Vacuum switching valves are common evap problems
PCM driver damaged for evap components
Incorrect engine installed.
Idle speed control motor faults when cold.
Broken tooth on the crank gear.
Most common cause of P0446
MAF sensor hotwire contamination
Fuel pressure regulator failure
EGR position sensor causing surging, misfires
Faulty IAC valves are somewhat common
ABS code C1241.
ABS code C1242.
ABS code C1244.
ABS code C1245.
ABS code C1246.
ABS code C1248.
ABS code C1251.
ABS code C1252.
ABS code C1255.
ABS code C1256.
ABS code C1274.
ABS codes C1235, C1236, or C1237.
ABS codes C1231, C1232, or C1233.
ABS codes C1225, C1226, or C1227.
ABS codes C1221, C1222, or C1223.
A/F ratio sensors causing extremely rich condition
EGR valve hanging open intermittently
EGR temp sensor coated with carbon
Aftermarket timing belt causing trouble codes.
Fuel injector faults
Knock sensor sub harness faults
Firing order wrong after tune-up or coil/wire replacement
Timing faults causing P1346, P1351, P0335, P0340 or other codes
Security system causing no-start.
AC blower motor only works on high speed.
Timing belt or crank gear
Intermittent horn operation.
The ABS light is on and the cruise control does not work.
Multiple electrical accessory failures.
O2 sensor identification
Rev limiter engaging while driving.
Injector connectors swapped.
Hoses switched at the purge valve
Canister causing evap codes
Non-electronic struts installed.
Vacuum hose to map sensor
COP ignition causing misfires on the DOHC 3.0
Poor ground at MAP sensor
Common EGR faults
Crank sensor or reluctor ring damage
Poor ground circuits
MAF sensor causing low power and lean codes
ABS codes will not clear.
Intermittent cruise control operation.
Spark plugs causing misfires
Wiring break or short at firewall.
Variable valve timing issues
Vacuum hoses installed wrong
MAF sensor causing rich codes
EGR with intermittent faults
Must use dual strap spark plugs
EGR system failures
Timing belt alignment
Crank sensor issues
MAF sensors fail frequently
Hose disconnected at air filter housing
Incorrect or wrong weight oil
MAF sensor problems on Hybrid
Air flow sensor faults
O2 sensor vs. A/F sensor
Sensor locations
Small glitch in TPS
Tight valve clearance
Dual strap plugs
Crank bolt causing severe power loss.
Damaged or mis-positioned reluctor
O2 sensor harness shorted on exhaust
Valve timing off
Check gauges message displayed.
Power door locks do not operate properly.
The blower motor is inoperative.
The battery goes dead after a short time.
The engine overheats after replacing the thermostat.
ABS pump operates at low speeds.
Shaking from power steering at idle.
Change brake pad message displayed.
Rear brake shoe wear.
Updated timing belt tensioner.
The blower motor only runs on the high setting.
Engine will not run after timing belt replacement.
The mode door is stuck in defrost.
ABS light is flashing after ABS controller replacement.
Transmission goes into limp-in mode.
The tachometer is inoperative.
The digital odometer does not work.
The speedometer is inoperative after replacing the TCM.
Air flow Meter spring is broken or weak
Air flow meter tamper or attempted adjustment
Wiring harness rubbing between intake manifold
Knock sensor harness problems
Computer hitting over-speed shutdown around 55 MPH
Air Flow meter shorted internally
EFI main relay fault
IAC causing high idle speed or surging at idle
Bad Thermo time switch
Faulty ignition coil causing multiple symptoms
Distributor indexing incorrect
Common EGR failures
Intermittent problems with fuel pressure regulator
Timing retard due to knock sensor
EGR sticking intermittently
Faulty canister closed valve
The engine will not run after battery discharge.
Vibration while accelerating.
The vehicle is in limp-in mode.
IAC faults
The compressor clutch will not engage and the cooling fans runs constantly.
Turn signals and flashers inoperative.
The climate control system display is blank.
Gauges inoperative, transmission stuck in second gear, engine starts and stalls.
A very audible fan-like noise.
VSS or TPS shorting crank/cam signals
Soft pedal after pad replacement.
Multiple steering issues.
Variable valve timing problems
Harness damage to crank sensor
Crank reluctor damage
All gauges are inoperative.
MAF sensor failures
The AC/heater controls are flashing.
Cam timing incorrect or crank reluctor damaged
Scan tool pulls undocumented code FD.
TPS and sub TPS connectors switched
Excessive carbon build-up
Electronic throttle control faults
Very bad bucking at highway speeds.
ABS light is on with no codes.
EGR pipe and passage carbon
ABS and brake lights are on, speedometer is inaccurate or inoperative.
Tapping noise from rear of engine with possible low power issue.
Faulty VSV for EGR
The speedometer does not show lower speeds. The ABS and brake lights may be on.
The engine will not run after replacing the BCM.
Transmission in limp-in with no communication to scanner.
The AC clutch will not engage.
The speedometer is inoperative.
The tachometer does not work.
Problem with aftermarket air filters
Dirty throttle plate
Alternator has no output and the AC clutch does not work.
After PCM replacement, the ABS light is on.
Transmission failure causing stalling
Throttle relearn procedure
Carbon build-up on intake valves
PCM update for random misfires
Ignition coil update
Updated PCM for P0773
Updated Converter/Inverter
PCM update and pipe update for P0420
Common causes of P3190, P3191, P3101
Updated Hybrid control ECU
Updated Accelerator Pedal Assembly
Faulty HCAC bypass valve
Skid control ECU update
PCM update for catalyst codes
Fuel pump failure
Restricted line at canister
EGR vacuum solenoid failures
Crank gear reluctor damaged
Coolant leaking on PCM
Timing belt alignment incorrect
ECT sensor failures
The main fusible link blows.
Excessive vibration after timing belt replacement.
The AC system is inoperative.
Timing chain jumped or reluctor damaged.
Cooling system flush causing P0128
Broken wire at crank sensor.
Downstream O2 sensor can cause lean or rich codes.
Rotor button installation
Failed igniter unit
Timing belt/cam timing incorrect
Transponder key bad or missing
Throttle stop tamper or dirty throttle body
30 Amp EGI fuse blown
Blown intake gasket
EGR ports plugged with carbon
PCM damage due to spill
Timing belt off causing cam codes
EGR boost sensor vacuum line
Crank sensor air gap
Plug boot burn through
Tank refilled with engine running
Injector connectors accidentally swapped.
Pressure regulator ruptured
Solenoid connectors swapped.
IAC valve needs cleaning
Oil pressure relief valve stuck
Crank sensor harness chaffing
ECT causing no-start when cold, or after hot soak.
Faulty EGR pressure sensor
Faulty IAC valves are common
ECM harness breakage
Coil on Plug system failures
Vacuum leak at PCV hose
PCM coil driver failure
Upper intake gaskets leaking vacuum
Oxygen sensors read 0 volts constantly.
Connectors accidentally switched
Vacuum port to boost sensor plugged
Crank sensor mounting bolt loose
Repeat distributor failure
Variable induction system
Valve covers leaking oil onto plug wires
Wires broken at purge solenoid
IMRC actuator and PCM failure
Intake gaskets
Boost sensor solenoid vacuum port
Fuel pressure regulator sticking open
PCM update for P0481
PCV hose causing lean codes and rough idle
O2 sensor identifications
O2 sensor bank identifications
Timing alignment marks can be confusing
Throttle stop adjustment or sticking IAC causing high idle.
Balancer damage causing low power.
Engine oil keeping valves open
Valvetrain problems
IMRC shaft sticking
Ignition coil causing CKP codes
Blown fuse setting multiple codes
MAF sensor causing stalling immediately upon start-up
Wrong fuel injectors
PCM reflash for Flex fuel vehicles
Balancer or keyway worn or broken
Connector under drivers seat
Relays
Canister vent solenoid failures
Excessive RFI causing P0320
ABS light on.
Power door locks try to activate.
The crank pulley bolt will not break loose.
Large oil leaking from behind timing cover.
ABS light is on and will not clear.
Speedometer indicates 20 mph when the vehicle is not moving.
Reading and clearing ABS/TCS and air bag codes without a scan tool.
Coil or Rotor faults
EGR system faults
Intake valve wear is common
Split air intake hose
Fuel pressure regulator faults
Distributor unit has failed
Base idle tamper causing P0505
Timing belt or crankshaft reluctor faults
Evaporative faults
EGR open at idle
Soda drink contamination
Alternator does not charge at startup.
Inconsistent idle after transmission flush.
Plug boots burned or carbon tracked
Mass air sensor problems
Suspension clunk.
Noise from power steering pump.
Brake pedal going to the floor, usually intermittent.
Cutting Honda non-floating rotors to fix a pulsation.
Repeated axle seal leak.
Timing belt problems causing codes
SRS light is on.
Reading and clearing ABS codes without a scan tool.
Reading and clearing ABS codes without a factory scan tool.
Recall for ignition coils
Blown intake gaskets
EGR system problems
One spark then no start
Throttle stop adjustment tamper
Coolant leak.
The ABS pump constantly runs.
One or both of the rear window motors are inoperative.
Intake problems
Properly timing the balance shaft belt.
Plug wires and coil failures
MAF contamination
Worn crankshaft thrust bearing
Crank gear keyway broken
Air Flow sensor spring tension problems
EGR boost sensor relocation
Crank sensor air gap or bracket
MAF causing rich and lean codes
EGR boost sensor hose or vacuum port
EGR ports plugged with carbon deposits
Excessive oil consumption.
EGR boost sensor and/or solenoid failure
Air intake boot split/cracked
PCM reflash for P1170
PCM update for P0507
Weak ignition coil or burned rotor
Aftermarket Cap and Rotor causing codes and rough running
Plug wires and valve cover gaskets
Water damage to PCM and connector
Timing belt jumped
Aftermarket distributor caps and rotors do not work well on this engine
Faulty MAF sensor or hotwire contamination
Air intake hose split
Cam or crank gears slipped
Vacuum leaks causing rev limit
Vacuum Ts leaking
Timing belt alignment is incorrect
Super charger using oil
Coolant in the oil.
Rear drum brake grabbing.
Crank sensor air gap too small
Poor PCM internal grounds
Air intake hose or resonator cracked
Distributor cap failures
EGR valve causing drivability issues
Aftermarket exhaust causing EGR codes
Wrong timing marks used
Subaru EGR system failures
Headlamp door motor.
No/low clutch pedal.
Mass Air Flow meter failures
The alternator will not charge.
Test connectors touching
Instrument cluster problems.
Cam belt alignment
The rear defroster does not work.
Exhaust valve guide problems
High idle codes, decel stalls, decel stumble
The brake lights do not work or do not turn off.
A/F sensor faults
Fuse loose in fuse panel
Speed sensor codes
MAF causing stalling
IAC failures
Coolant temp sensor failures
Cam and crank sensor issues
Power steering pump noise.
Side air bag light is illuminated.
Coolant in the oil system.
Cruise control inoperative.
Corrosion in harness near canister drain valve
Knock sensor failures
A/F ratio sensor causing misfire codes
Erratic spark or spark on one coil only
Reoccurring P0420
Poor grounds at body or engine
Valves too tight causing rough idle, excessive emissions
PCM failure
TPS wiring harness issues
PCM update for A/F sensor codes
Tumble valve issues
SRS light is on with no codes stored.
Wipers come on with headlights.
Blower motor operation.
Always replace the oil pump drive o-ring when replacing the intake manifold gaskets.
Bad batteries and dirty throttle plates
Carbon tracked plug wire boots
Shorted sensors
EGR valve open at idle
Knocking on cold start.
No-start, ASD relay fuse blown
PCM internal coil driver failure
Timing belt has jumped
EGR BPT failures
Upstream O2 sensor failure
Crank or Cam Sensor failure
Intermittent ASD relay failure.
Cannot communicate with the sensing diagnostic module.
AC compressor intermittently shuts off.
Timing belt 1 tooth off
The AC compressor does not engage.
The cruise control operation is erratic.
Noise from the front suspension.
Fuel pump relay voltage drop
Connector corrosion causing P1494
Turbo hose connections loose
Roll over valve leaking
Turbo hose connections
High PCM failure rate
New fuel pumps keep going bad.
Faulty fuel pump relay module
Shaking from front end.
Chirping from engine.
Timing marks not completely accurate
EGR valve and transducer
Purge flow solenoid installed upside down
Bucking when turning.
The blower motor will not turn off.
Grinding from rear differential.
Crank sensor inop
Carbon tracked ignition cables
Speedometer and tachometer are intermittently inoperative.
Shorted sensors causing no start
O2 sensors causing blown ASD relay fuse
Repeat oil leak from the rear of the engine.
The instrument cluster intermittently fails.
Camshaft gear alignment pin broken
Crank sensor signal erratic
Timing marks not perfect
Theft system activated
Coolant leak from front of engine.
Oil leak from rear of engine.
Ignition failure sensor or capacitor fault
Popping or cracking from front suspension.
MPI main relay failure
Faulty EGR control solenoid
Crankshaft reluctor damaged when replacing timing belt
Crank position sensor harness shorting
Intermittent EGR problems
Timing belt causing misfire codes
Distributor coil or igniter failures
Timing belt damaging crankshaft reluctor
Cam and/or crank sensor codes
High IAC failure rate
Fuel pump module
P0125 is an oxygen sensor fault, not ECT
Weak distributor or faulty rotor
Faulty distributor
Crank gear worn
Crank sensor reluctor wheel
Incorrect code P0100
High rate of PCM failure
Weak coil or defective rotor and cap
CKP sensor causing high RPM cut out
Faulty MDP sensor
Low detection switch
PCM reflash and O2 replacement for P0154
Vacuum control valve fault
Restrictor and vacuum supply
IAC valve damaged by throttle body cleaning
One coil not firing
Incorrect Cylinder ID
O2 sensor ID
Inspect the correct cylinder for misfires
O2 sensors failing when hot.
Knock sensor failures due to water
One side of engine misfiring.
High rate of FPR failure
Intake gasket problems
Distributor cap causing hard kickback on starting
MAF sensor causing low power and system lean codes
Fuel pump connector
Faulty aftermarket distributor caps
Ignition switch failures
Crankshaft worn
New crank sensors are faulty
P0446 faults
High rate of fuel level sensor failure
Fuel pump failure rate is very high.
Ignition control module
Communication faults
Wiring at fuel pump housing is bad
O2 sensor causing misfiring
Distributor shaft magnetized
Poor vacuum signal to MAP sensor
Corrosion inside the VCM
O2 harness shorting to ground
Exhaust valves sticking due to carbon.
Injector poppets clog after engine work
Fuel pressure regulator leaking
Gas contaminating the PCM
Distributor installed incorrectly
Distributor cap causing misfires and hard start
Faulty canister vent valve
O2 sensor failures
Fuel tank pressure sensor shorted
Intake gasket internally leaking
Broken wires to ignition coil
Air pump failure
Air check valve failures
PCM injector driver shorting.
One plugged converter
Water and rust in fuel rail
Faulty vent valve
Wiring breakage for electronic throttle control
Wiring harness rub through at left control arm
High crank sensor failure rate
Ignition coil has failed
Issues with variable valve timing
Wiring chafing under master cylinder
Crankshaft gear grooved and offset
O2 wiring shorting on AC line
High failure rate of MAF sensors
No spark, no fuel
Cam sensor codes and valve timing
Broken wires near brake booster
TPS failures
Plug wire faults
Intermittent main relay
PCM failed
High rate of IAC failure
Intermittent lighting failure.
Distributor synched improperly
Harness shorting on transmission housing
Transmission causing stalling at idle or at stops
Broken power feed to ignition coil
Poor ground in the rear cargo area.
Purge and canister solenoid valves
MAF sensor problems
P0700 description
Coolant temp sensor voltage too low.
Faulty G Sensor
Crank sensor is faulty
Faulty TPS causing high idle speed
Faulty coolant temp sensor
Intake gasket blown at cylinder #1
Plug wires switched for cylinders 1 and 4.
Faulty plug wires and ignition coils.
Faulty ignition failure sensor
MAF sensor calibration
EGR solenoid sticking
TPS glitches
Plug wires and misfires
PCM update for P0130, P0530
Transmission oil temp sender.
Poor ground causing transmission issues
Pulse generator failures are high
Faulty relay or wiring harness short
Faulty or misadjusted range switch
High idle in extremely cold climates.
PCM update for P0116
PCM update for O2 codes
Fuel pump campaign
Blown intake manifold gasket
Fuel pressure regulator diaphragm ruptured
Timing belt installation is confusing
Broken wires near vent solenoid
Cracked exhaust manifold
Ignition module recall
Faulty ignition switch
Air pump and check valve failures.
Canister purge and/or vent solenoid
EGR vacuum hose orifices
Faulty MAF sensor causing lean codes
Damaged crank sensor
CKP causing rough running
Throttle plate or IAC valve
IAC sticking open or is defective.
Distributor, coil, or igniter failure.
Crank sensor reluctor has spun
Faulty cam position sensor
Ignition switch low voltage
Converter clogged or partially clogged.
Complex timing belt installation
Dirty or bad MAF sensor
Timing belt woes
Intermittent CMP
Mass Air Sensor
Crank sensor faulty
Throttle body and wiring harness update
Main Relay update
Faulty crank sensor giving transmission codes
Codes galore
Intermittent MAF sensor faults.
Vent control valve fault
ECU injector driver shorted in ground internally
Burned rotor, weak coil
Faulty or dirty Air Flow Sensor
ECT causing surging and possible codes
Faulty connector or loose connection
False codes
High resistance at ignition failure sensor.
Leaking Fuel pressure regulator
One or two faulty crank sensor
Plug wires and oil leaks
Saturn EGR failures
Air flow meter issues
MAF sensor
High idle
Cam sensors and timing belts.
Diagnosis Module for Tank Leakage
Engine Control Relay or Main Relay.
Cracked exhaust manifold or flex pipe
Possible Cluster Fault
Ignition coil boots carbon tracked
Security Transponder Keys
Connector issues after repair work
Loose timing chain or broken guides
Valves not seating fully
Hose broken at EGR BPT valve
Coolant temp sensor out of range
High rate of relay failure
Underhood fuse panel issues
Coil and O2 sensor connectors accidentally switched
Poor MAF and computer grounds
Flexplate deflection
Cracked or loose air intake hose
Crank and/or cam sensor failure
Wrong spark plugs used
Poor PCM grounds are common on this vehicle
Air Flow sensor dirty or skewed
Timing belt jumped, broken or stripped
CKP sensor cause long crank time
TPS and transmission codes
Computer ground located under PCM
Cam timing and excessive emissions
Plug wire carbon track or burn through
TPS harness issues
Connector issues
EGR valve not fully closing
Poor MAF ground circuit
Faulty ECT readings
Timing belt alignment issues
Carbon track or oil soaked plug wires and coil boots.
Crank gear keyway rusted away
Crank sensors causing hard start, no-start
Crank sensor causing erratic behavior
EGR opening too much
Crank sensor and/or cam sensor
Erratic or unstable idle
Fuel pump cut off switch
Fuel tank pressure sensor disconnected
Carbon restricted EGR passages
Failed ignition relay
Crank sensor no-start failure
Very high rate of CMP sensor failure
Timing chain failure or incorrect installation.
Dripping injectors
Long crank time before starting
TPS or O2 voltage shorting TPS signal
Cracking vapor hoses
Low idle and stalling at stops
Neutral switch or trans range switch connector
Shorted O2 sensor causing blown fuse
Crank sensor variation learn
Injectors clicking KOEO
Crank sensor reluctor ring
P0101 faults
TPS, MAF connector problems
TPS ground circuit
Corrosion under carpet at ECU
Exhaust backpressure
EGR and passages
Connector problems
IAC passages
Connector problems behind headlight
EGR and rough idle
Cam sensor reluctor change
Cam sensor leaking at connector
Corrosion at connectors C101 and C102
Distributor and crank sensor connectors swapped.
Repeat fuel pump failure or stalling
Damaged turbine shaft O-ring
Wiring harness chaffing and breaking
Faulty IAC valve
Engine overheat enrichment after coolant flush
Failed Main ECM relay or fuel pump relay
Faulty MAF sensor
Injector harness shorted
Wiring harness for injectors
EGR ports blocked with carbon
Noise suppressor
Crankshaft keyway damaged
Main relay failure
Extended fast idle
Faulty vacuum hose causing EGR codes.
EFI harness shorted to ground
Fuel pump harness shorted.
High idle or surge at idle.
Corroded connector for fuel pump
EGR vacuum solenoid
Crank reluctor installed wrong or timing off
Fuse blown
Worn crankshaft keyway
EGR ports and vacuum hoses
Fuel pressure regulator has failed
Catalyst efficiency
Oxygen sensor heater circuits
Ford System lean codes
Ford EGR flow codes
MAF sensor codes
Coolant temp sensors and codes
TPS codes
Insufficient coolant temperature code
O2 sensor signal codes
System rich codes
Diagnosing misfires
Distributor, igniter or coil failure
Faulty camshaft position sensor
Cam sensor codes
Low voltage supply to coil
Gas tank liner deterioration
Wiring rubbing on transmission solenoid pack
Evap hose leaking or hoses cracked
Cam position and valve timing phase sensors
Transfer case control module communication errors
Very high failure rate with VW MAF sensors
No start with no spark
Vacuum line or check valve faulty
ABS controller failure
Idle adaptation
Engine speed sensor
Volkswagen coolant temp sensors
MAF sensors and P0102
Turbo hoses loose or disconnected
Air intake hose cracked, loose, leaking
Rotor button shorting
P1624 Transmission fault notification
Immobilizer system
Broken vacuum hoses are common
Throttle adaptation lost
Incorrect timing belt or distributor installation
Alarm module burned out by jump starting.
Battery causing low power and codes
MAF sensor oil contamination
No power at coil or module
Ignition switch partial failure
Blown fuse for air pump
Faulty wiring
Faulty ignition coil or power transistor
Faulty power stage and ignition coil.
MAF causing hesitation
PCV hose cracked
Ignition coil on plug misfires
Vacuum leaks common on turbo engine
Plugged fuel injectors
Cam sensors, valve timing, and timing belts
Throttle adaptation lost and no power
Moderate cam sensor failure rate
Air injection vacuum hoses broken or bad combination valve
Plugged air injection passages
Air injection Pump Relay
Coolant temp sensor and hard starts
Bad Coil causing transmission or TPS codes
Mercedes MAF sensors
OVPR Over Voltage Protection Relay
Poor power feed to ignition coils
Ignition key transmitter
Wiring harness problems
Idle control malfunction codes
Ignition Discharge Modules have a high failure rate.
Spark plugs
Throttle body fault or reset procedure required
Intermittent crank sensor issues
Intermittent purge valve faults
Strong PCV system
Vent valve vacuum leaks
Vacuum leaks at valve cover gaskets
Bad vent valve in intake manifold
Deceptively plugged EGR ports
Faulty ignition coils or boots
Manufacturer misfire codes.
Transfer case damage
BMW MAF sensors
Leaky intake gaskets
Broken vacuum hoses for secondary air injection
Plugged air injection passages in the head
Electronic thermostat
Damaged air pump due to water or condensation.
Timing chain jumped on one or both heads
Washed down cylinders
Air intake hose cracked/split
Brake switch, clock spring or throttle body
Intermittent hard stall while driving
Jag MAF sensors
Vacuum Elbow or intake leak
Intermittent Purge Valve
Very slightly blown head gasket
PCM and no starter engagement
No start after engine or flywheel swap
Cracked evap hoses near air cleaner
Flex fuel vehicles with rough/rich conditions
Cooling fan relay/module
Rich Flex fuel 3.3
Nissan MAF sensor failures
Faulty TPS/Throttle body unit
Ignition coils and spark plug wells
Locating the coil causing P1320
Sludge or solenoid causing cam codes
Swirl Control Solenoid or Switch
No-start or rough running/MIL after clutch replacement
Intermittent stall or no-start
Mercedes 3.2 EGR codes
Chrysler P0700 and P0500
Fuel pressure regulator leaking fuel into intake
Injectors causing misfire codes
Intake valve carbon build-up
Shorted MAP, TPS or EGR
Chrysler MAP sensors
Ford ESM
IAC windings shorting PCM drivers
Shorted electric motor mounts
MAF sensor causing O2 codes
O2 harness shorted on exhaust or heat shields
BMW transponder key problems.
BMW cam position sensors
Leaking intake runners or t-body gasket
Thermostat allowing flow when cold.
Intermittent stalling due to crank sensor
Oil level sensor blowing fuse causing no-crank
Water contamination in the Motronic control unit.
Poor grounding at distributor
Incorrect code number P0481 or p0181
Vacuum leak at PCV hose near throttle body.
Carbon tracked plug and coil boot
Wiring harness to ignition coils misrouted
Vacuum hose disconnected or rotting for LDP
Distributor rotor problems
BMW purge valve
False 1215 MAF code
Cam sensors causing hesitation and low power
Air injection vacuum control solenoid
Idle switch
Throttle switch malfunctions
High failure rate of Saab ignition discharge modules
Check cranking voltage
Picky with spark plugs
Faulty thermostat, stuck open
PCV hoses and intake gaskets
Transmission neutral switch
Intermittent stumble or stall at idle only
Poor grounds at engine and intake
Intermittent Saab MAF sensors
Wastegate rod siezed
Faulty ignition switch causing intermittent stall
Charge air bypass valve
Ignition discharge module causing misfires under a load
T-stat causing hard start or long crank time when cold
Saab idle quality and possible lean codes
VW cam position sensors
VW coolant temp codes
Volkswagen purge control valves
Vacuum leaks causing idle adaptation codes
Faulty O2 sensor causing fuel trim codes
Faulty fuel pump relay causing trouble codes
Fuel pressure regulator and/or vacuum hose
Bad aftermarket cam position sensor
Cam gear slipped, pin broken
Kia 2.4 crank sensors and reluctors
Kia purge flow and vent valves
EGR solenoid sticking closed
Exhaust manifold cracks causing O2 and lean codes
2.4 timing belt jumped
Using used parts
Map sensor port blockage
Hole burned through coil
P0601 internal PCM error.
Late model GM Catalytic converter problems
Re-torque intake bolts and install updated springs
BCM problems
Security relearn after battery disconnect or drain
Probable thermostat operation
Throttle body and harness malfunctions
Throttle re-learn procedure
Corroded connecter in drivers side kick panel
Vacuum leaks and un-metered air leaks
Cracked hose can cause lean or rich codes
Volvo MAF sensor failures
Faults in other modules
Volvo secondary air injection
Common cam sensor failure
ECT causing hard start or no-start
Rotor and distributor cap failures
Relay problems
Ground wire left loose or corroded at motor mount
Grounding and power supply issues
Radio suppression relay
Old style European fuses
Faulty Volvo crank sensors
Chrysler charging system control
Injectors and relays clicking key on engine off
Cooling system codes
Long cranking time before engine starts or intermittent no-start
GM 8.1 crank sensors
No power on acceleration
Faulty O2 sensor causing misfires and possible codes
Hesitation or bog that comes and goes
Poor ground connections under drivers door area
Sticking IMRC rods or poor vacuum
EGR passages behind throttle body plugged
CKP sensor signal degradation
Purge valve causing system lean codes, rough idle, excessive emissions
Security Failure
Poorly grounded
Carbon, valves and valve guides
Harness rubbing near throttle body
Distributor cap and carbon button
Distributor cap ground strap
Water in spark plug wells
Update sensor and harness for knock codes
EGR valve or backpressure tube plugged
EGR backpressure hose broken/burned
Nissan MAP/Baro solenoid
Skewed oxygen sensors
Synchronizer shaft wobble causing codes
Chrysler P0622 alternator faults
Oxygen sensor ground circuit splice
Generic Mitsubishi EGR tip
Resetting Nissan Electronic Throttle Body
Jeep PCM coil driver failure
Volvo evap components
Faulty EGR valve and Pipe
Volvo electronic throttle control
Crank sensor interference
Volvo oxygen sensor codes can be deceiving
Crank sensor or cam sensor
Nissan Knock sensor problems
Transmission and throttle angle calibration issues
Faulty TPS and updated software
PCV vacuum harness
Possible updated hose or missing switch
Out of Calibration Volvo MAF
ABS controller and wheel speed sensor
Volvo MAF causing system rich codes or rough idle.
Oxygen sensor heater circuit malfunctions.
Intermittent no-crank condition
Nissan 3.3 optical distributor
Poor O2 sensor grounding
Poor fuel injector harness connections
Converter backpressure causing random misfires and low power
Hemi IAC codes
Distributor gear worn
Two part TPS
EGR ports causing P0402 excessive EGR flow code
Fuel injector problems causing misfire on start-up
Nissan distributor shaft failure
Timing belt alignment causing P0340
Oxygen sensor failing intermittently
Chrysler evap hoses
Cruise cancel switch causing issues
Different camshaft reluctors
Intermittent IAC faults
Valve spring issues on the 3.7 Jeep
Mazda EGR boost sensor faults
Hoses at fuel tank
Ecotec ignition control module and coils
Canister vent valve not sealing
Fuel pressure drops off after a distance
Fuel Pump Driver Module connector and power feed
Wires rubbing on IMRC shafts and linkage.
Crank sensor waveform breaking down
Internal PCM fault
Intermittent cam sensor operation
Grounding problem for fuel pump and brake lamp
EGR pintle plugged with carbon deposits.
Wrong firing order printed
Vacuum leak behind intake plenum
Idle bypass screw tamper or stuck IAC motor
Tail lamp socket causing C1295
PAD lamp fault
Intake manifold and backfire valve
Faulty cam position sensor that may not code
O2 harness shorted on transfer case
Some use CCD type ignition module.
CKP, CMP or VSS shorting out Communication
Cam Phase Incorrect
False MAF code caused by air inlet tube
Faulty VMV driver in PCM
Ford intrusive O2 test
GM Linear EGR valves
Security systems
Weak permanent magnet
Converter causing EGR problems
Harness chaffing near left wiper pivot.
Ground wire corrosion or broken
Electronic AIR check valve stuck closed
Typical Air Injection failures
EOT sensor faulty
Broken valve spring common
Vibration and rough idle
O2 sensor connectors
FPDM Connector
Broken balancer and crank sensor issues
Weak battery and dirty throttle body
Harmonic balancer slipped
Starts when checking for spark
Evap Vent Solenoid causing evap leak codes
PCM causing misfire and rough/surging idle.
Multiple TPS and throttle motor codes stored
Evap leak at fuel fill neck
Intermittent fuel pump relay
EGR codes return after clearing
PCM Fuse blown
Faulty Injector Driver Module
Connector problems at valve cover.
Failed injector and/or O-rings causing no start
Stuck IPR or open circuit to IPR
Faulty cam position sensor common on powerstroke
Intermittent PCM reset
Code P1688 is very common
Plugged EBP sensor pipe
Cam sensor air gap causing drivability problems
Failed ICP causing crank-no-start.
Exhaust backpressure valve stuck closed
IPR causing harsh bucking and surging.
Glow plugs and glow plug relays
Reflash for false P0340
Using ICP and IPR for hard start
Low oil or weak primary oil pump
Misfire, rough running after repairs
Fuel line fitting seals deteriorating
Low power or loses power under higher loads
Worn engine and turbo due to poor air filtration
High oil pressure leaks
Old and thick oil causing hard starts on cold morning
Rough erratic idle caused by faulty ICP sensor or IPR
Failed IDM module and water intrusion
EGR hanging on the 6.0 Diesel
Faulty TAC can cause a hard stall and a crank-no-start.
Firing order and plug wire routing
Faulty ICP sensor
Stuck IPR causing no-start
Faulty injectors causing misfires
Faulty Idle Validation Switch
Old foaming oil causing rough idle
Intermittent high pressure oil leak
Dual mass flywheel causing idle vibration/miss and rattle noise
Sudden loss of power/throttle response
Converter breaking apart
Mixed up sensors
Crank sensor cutting causing engine to bog
Toyota A/F sensors vs oxygen sensors
Broken or jumped upper timing chain
Fuel solenoid driver module failed
Very high failure rate of ignition coils
Snap to connect fitting broken, updated bracket
TCC solenoid sticking when cold
Upstream converter broken
Updated heat shield
Line pressure solenoid ground wire
Ignition coils melted
Rear sensor causing code for front sensor
Trans solenoid sticking.
Mild backpressure causing P0410 and/or low power
Check oil level and condition
Injector windings shorted
Leaking PS pressure switch
Open or shorted windings
IAC hanging high or low
Hesitation/low power at higher RPM ranges
Noisy supercharger causing reduced timing and power
PCM update for P0103
Drivers side impact air bag connector
Fuel pump issues causing long crank and hard starting
Variable valve timing and solenoid issues
Faulty crankshaft position sensor
Purge stuck open
Throttle plate needs cleaning
Over Reporting MAF sensor
Updated valve springs and seals
Oxygen sensor not heating up quick enough
Wrong O2 sensor listed in parts catalog
Intake gaskets causing MAF codes and more
Evap leak at filler neck area
MIL on with codes P2646 and/or P2647
O2 sensors incorrectly connected
PCM update for P1275
Sticking power steering pressure switch causing high idle
Poor ECM Grounding causing U1000 or U1010
Extreme cold weather causing no-crank condition
Burr on CKP reluctor plate can cause P0335
Connector issues causing multiple symptoms
Seatbelt pre-tensioner harness
Updated valve body to address P0840 and low power concern.
Extreme cold causing P0710
Coil leaking voltage past boot connection
Liquid Vapor Separator cracked
Updated 2nd gear switch
Intermittent cam sensor failure
Subaru purge valve causing vent valve codes
Slight purge valve leak
Throttle plate causing MAP codes and more
EGR tube plugged with deposits
Hoses under intake manifold leaking vacuum
Fuel level sensor problems
High rate of ignition coil failure
Hard misfire due to carbon tracking
PCM will not relearn closed valve position
O2 sensor failing and causing misfires
Fuel injector stuck closed
Broken and corroded vent valve harness
Faulty vent valve/pump module
Volvo IAC sticking
Fuel pressure slightly high
Dual plug ignition coil
Intermittent cam sensor codes due to insulation break down
AC clutch causing blown fuse for BCM power
Trans temp sensor may break during removal
EBCM Faulty
Main power feed broken at starter
Water intrusion causing misfires
Weak ignition coil causing various driveability concerns
EGR cooler leaking coolant into intake
Broken filler neck, crack just below fuel cap.
Faulty crank sensor causing no-start or intermittent stall and codes.
Torque converter faults
Leak at upper gasket on throttle body
O2 sensor dies when hot
Wire broken at purge solenoid
Cam timing off by one tooth
Broken wire for PATS
Plug wire burned through at boot
Check valve broken
Head gasket causing repeated catalyst failure codes.
Fuel Injector Failure
TPS causing intermittent high idle condition
Injector harness shorting on studs
Harness and speed sensor problems
Spark plugs causing PCM and Coil failure
Vacuum leak at vacuum resovior
O2 sensor causing a surging or rhythmic roughness at idle
Split air intake hose causing lean codes
Rocker arms popping out
EGR pipe and/or throttle body port
Stuck PCV causing a high idle and P1506
Hard misfire caused by shorted ignition coil.
Traction control faults
Vacuum leaks causing O2 sensor codes
Hidden Vacuum Leak
FPR intermittent leak
EGR ports at rear of intake manifold
Poor ground at bell housing causing ABS code
Air inlet hose allowing water ingestion
Ignition switches and solenoids
Fuel pump failures
ASD relay driver
Breather hose cracked at intake manifold
Harness shorting on stud
No fuel pressure
PCV vacuum hose softens
O2 sensor failing intermittently causing drivability
Ambient temp sensor missing
Injector faults causing misfire codes
Ignition boot carbon tracking
Glow plug failed
PCM board causing stalling and/or no-starts
IAC valve binding and coked
Weak battery causing U codes
Fuel pump module cracked and broken.
High idle condition caused by TPS
Honda fuel injector failures
Whistle and rough idle
Multiple dead ignition coils
Crank sensor heating up
Water/Coolant in TDC connector.
Wires broken at evap vent solenoid
A/F sensor codes return after repairs
IAC shorting out drivers in PCM