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Plain English meanings for 159 common codes. Type your code to jump to it. No adapter needed.
Emissions 8 codes
P0401EGR flow is too lowP0402EGR flow is too highP0404EGR valve is not moving the way it shouldP0411Air pump (secondary air) flow is wrongP0420Catalytic converter is not cleaning well enough (bank 1)P0430Catalytic converter is not cleaning well enough (bank 2)P2096Exhaust after the converter shows too much air (bank 1)P2097Exhaust after the converter shows too much fuel (bank 1)
Fuel and air 25 codes
P0068Air flow does not match the throttle positionP0087Fuel pressure is too low in the fuel railP0088Fuel pressure is too high in the fuel railP0089Fuel pressure regulator is not working rightP0090Fuel pressure regulator control wiring problemP0101Air flow sensor (MAF) reading is out of rangeP0102Air flow sensor (MAF) signal is too lowP0103Air flow sensor (MAF) signal is too highP0171Engine is running lean (bank 1)P0172Engine is running rich (bank 1)P0174Engine is running lean (bank 2)P0175Engine is running rich (bank 2)P0190Fuel rail pressure sensor circuit problemP0191Fuel rail pressure sensor reading does not fitP0193Fuel rail pressure sensor signal is too highP0201Fuel injector circuit problem (cylinder 1)P0202Fuel injector circuit problem (cylinder 2)P0203Fuel injector circuit problem (cylinder 3)P0204Fuel injector circuit problem (cylinder 4)P0205Fuel injector circuit problem (cylinder 5)P0206Fuel injector circuit problem (cylinder 6)P0207Fuel injector circuit problem (cylinder 7)P0208Fuel injector circuit problem (cylinder 8)P0230Fuel pump power circuit problemP2187Engine runs lean at idle (bank 1)
Ignition and misfires 19 codes
P0300Engine is misfiring in more than one cylinderP0301Engine is misfiring in cylinder 1P0302Engine is misfiring in cylinder 2P0303Engine is misfiring in cylinder 3P0304Engine is misfiring in cylinder 4P0305Engine is misfiring in cylinder 5P0306Engine is misfiring in cylinder 6P0307Engine is misfiring in cylinder 7P0308Engine is misfiring in cylinder 8P0309Engine is misfiring in cylinder 9P0310Engine is misfiring in cylinder 10P0311Engine is misfiring in cylinder 11P0312Engine is misfiring in cylinder 12P0351Ignition coil A circuit problemP0352Ignition coil B circuit problemP0353Ignition coil C circuit problemP0354Ignition coil D circuit problemP0355Ignition coil E circuit problemP0356Ignition coil F circuit problem
Sensors 43 codes
P0106Intake pressure sensor (MAP) reading does not fitP0107Intake pressure sensor (MAP) signal is too lowP0108Intake pressure sensor (MAP) signal is too highP0112Intake air temperature sensor signal is too lowP0113Intake air temperature sensor signal is too highP0120Throttle or gas pedal sensor circuit problemP0121Throttle sensor reading does not fitP0122Throttle sensor signal is too lowP0123Throttle sensor signal is too highP0130Oxygen sensor signal problem (bank 1, sensor 1)P0131Oxygen sensor reads low (bank 1, sensor 1)P0133Oxygen sensor is slow to react (bank 1, sensor 1)P0134Oxygen sensor shows no activity (bank 1, sensor 1)P0135Oxygen sensor heater circuit problem (bank 1, sensor 1)P0136Oxygen sensor signal problem (bank 1, sensor 2)P0137Oxygen sensor reads low (bank 1, sensor 2)P0138Oxygen sensor reads high (bank 1, sensor 2)P0139Oxygen sensor is slow to react (bank 1, sensor 2)P0140Oxygen sensor shows no activity (bank 1, sensor 2)P0141Oxygen sensor heater circuit problem (bank 1, sensor 2)P0150Oxygen sensor signal problem (bank 2, sensor 1)P0151Oxygen sensor reads low (bank 2, sensor 1)P0153Oxygen sensor is slow to react (bank 2, sensor 1)P0155Oxygen sensor heater circuit problem (bank 2, sensor 1)P0156Oxygen sensor signal problem (bank 2, sensor 2)P0157Oxygen sensor reads low (bank 2, sensor 2)P0158Oxygen sensor reads high (bank 2, sensor 2)P0161Oxygen sensor heater circuit problem (bank 2, sensor 2)P0325Knock sensor circuit problem (bank 1)P0327Knock sensor signal is too low (bank 1)P0328Knock sensor signal is too high (bank 1)P0332Knock sensor 2 signal is too low (bank 2)P0335Crankshaft position sensor circuit problemP0336Crankshaft position sensor reading does not fitP0340Camshaft position sensor circuit problem (bank 1)P0341Camshaft position sensor reading does not fit (bank 1)P0344Camshaft position sensor signal cuts in and out (bank 1)P0345Camshaft position sensor circuit problem (bank 2)P0500Vehicle speed sensor problemP2135Throttle or gas pedal sensors disagreeP2195Front oxygen sensor stuck on lean (bank 1, sensor 1)P2270Rear oxygen sensor stuck on lean (bank 1, sensor 2)P2271Rear oxygen sensor stuck on rich (bank 1, sensor 2)
Cooling 7 codes
P0115Coolant temperature sensor circuit problemP0116Coolant temperature reading does not make senseP0117Coolant temperature sensor signal is too lowP0118Coolant temperature sensor signal is too highP0125Engine is slow to warm up for normal fuel controlP0128Engine is not reaching normal temperature (thermostat)P0217Engine is overheating
Oil pressure 5 codes
Transmission 15 codes
P0700Transmission computer has stored a codeP0705Gear selector (range) sensor problemP0715Transmission input speed sensor problemP0720Transmission output speed sensor problemP0730Transmission gear ratio is wrong (it may be slipping)P0740Torque converter clutch circuit problemP0741Torque converter clutch is stuck off or slippingP0750Shift solenoid A problemP0755Shift solenoid B problemP0760Shift solenoid C problemP0765Shift solenoid D problemP0780Transmission did not shift the way it shouldP0841Transmission fluid pressure sensor reading does not fitP0868Transmission fluid pressure is too lowP0869Transmission fluid pressure is too high
Electrical 6 codes
Computer network 5 codes
Fuel vapor (EVAP) 7 codes
Engine timing 7 codes
P0011Intake camshaft timing is too far ahead (bank 1)P0012Intake camshaft timing is too far behind (bank 1)P0014Exhaust camshaft timing is too far ahead (bank 1)P0016Engine timing sensors do not agree (bank 1, sensor A)P0017Engine timing sensors do not agree (bank 1, sensor B)P0021Intake camshaft timing is too far ahead (bank 2)P0024Intake camshaft timing is too far behind (bank 2)
Turbo and boost 2 codes
Idle speed 3 codes
Engine computer 7 codes
P0600Engine computer cannot talk to other computersP0601Engine computer memory check failedP0603Engine computer lost its saved settingsP0605Engine computer program memory errorP0606Engine computer processor problemP0613Transmission computer processor problemP0614Engine and transmission computers do not match
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About these codes
Codes that start with P0 mean the same thing on every car. P1 codes are maker-specific, B codes are body systems like airbags, C codes are the chassis like brakes and ABS, and U codes mean the car's computers are not talking to each other. Estimates only. A mechanic should confirm.