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Fault code lookup
Enter the code from your OBD reader or garage, for example P0420. You will see right away what it means, what may cause it and how urgent it is.
Common codes
Engine and transmission (P)
P0010Camshaft position actuator circuit (bank 1)P0011Intake camshaft timing over-advanced or system performance (bank 1)P0014Exhaust camshaft timing over-advanced or system performance (bank 1)P0016Crankshaft and camshaft position correlation (bank 1, sensor A)P0068Manifold pressure / air flow and throttle position correlationP0087Fuel rail / system pressure too lowP0088Fuel rail / system pressure too highP0089Fuel pressure regulator 1 performanceP0093Fuel system leak detected – large leakP0100Mass air flow (MAF) sensor circuitP0101Mass air flow sensor range / performanceP0102Mass air flow sensor circuit lowP0103Mass air flow sensor circuit highP0106Manifold pressure (MAP) sensor range / performanceP0107Manifold pressure sensor circuit lowP0108Manifold pressure sensor circuit highP0112Intake air temperature sensor circuit lowP0113Intake air temperature sensor circuit highP0115Engine coolant temperature sensor circuitP0116Engine coolant temperature sensor range / performanceP0117Engine coolant temperature sensor circuit lowP0118Engine coolant temperature sensor circuit highP0120Throttle / pedal position sensor A circuitP0121Throttle / pedal position sensor A range / performanceP0122Throttle / pedal position sensor A circuit lowP0123Throttle / pedal position sensor A circuit highP0128Coolant thermostat – engine stays below operating temperatureP0130Oxygen (lambda) sensor circuit (bank 1, sensor 1)P0131Oxygen sensor circuit low voltage (bank 1, sensor 1)P0133Oxygen sensor slow response (bank 1, sensor 1)P0135Oxygen sensor heater circuit (bank 1, sensor 1)P0136Oxygen sensor circuit (bank 1, sensor 2)P0141Oxygen sensor heater circuit (bank 1, sensor 2)P0171System too lean (bank 1)P0172System too rich (bank 1)P0174System too lean (bank 2)P0175System too rich (bank 2)P0191Fuel rail pressure sensor A range / performanceP0201Injector circuit – cylinder 1P0202Injector circuit – cylinder 2P0203Injector circuit – cylinder 3P0204Injector circuit – cylinder 4P0217Engine coolant over-temperatureP0219Engine overspeed conditionP0230Fuel pump primary circuitP0234Turbocharger overboostP0299Turbocharger underboostP0300Random / multiple cylinder misfire detectedP0301Cylinder 1 misfire detectedP0302Cylinder 2 misfire detectedP0303Cylinder 3 misfire detectedP0304Cylinder 4 misfire detectedP0305Cylinder 5 misfire detectedP0306Cylinder 6 misfire detectedP0325Knock sensor 1 circuit (bank 1)P0335Crankshaft position sensor A circuitP0340Camshaft position sensor A circuit (bank 1)P0341Camshaft position sensor A range / performance (bank 1)P0351Ignition coil A circuitP0352Ignition coil B circuitP0353Ignition coil C circuitP0354Ignition coil D circuitP0380Glow plug / heater circuit AP0381Glow plug indicator circuitP0400Exhaust gas recirculation (EGR) flowP0401EGR flow insufficientP0402EGR flow excessiveP0403EGR control circuitP0404EGR control circuit range / performanceP0420Catalytic converter efficiency below threshold (bank 1)P0430Catalytic converter efficiency below threshold (bank 2)P0440Evaporative emission (EVAP) systemP0441EVAP system incorrect purge flowP0442EVAP system small leak detectedP0446EVAP vent control circuitP0455EVAP system large leak detectedP0456EVAP system very small leak detectedP0480Cooling fan 1 control circuitP0500Vehicle speed sensor AP0505Idle air control systemP0506Idle speed lower than expectedP0507Idle speed higher than expectedP0520Engine oil pressure sensor / switch circuitP0562System voltage lowP0563System voltage highP0571Brake switch A circuitP0600Serial communication linkP0601Control module memory checksum errorP0606Control module processor faultP0641Sensor reference voltage A circuitP0670Glow plug control module circuitP0700Transmission control system malfunctionP0705Transmission range sensor circuit (PRNDL input)P0715Input / turbine speed sensor circuitP0720Output speed sensor circuitP0730Incorrect gear ratioP0740Torque converter clutch circuitP0750Shift solenoid AP2002Diesel particulate filter efficiency below threshold (bank 1)P2096Post-catalyst fuel trim too lean (bank 1)P2097Post-catalyst fuel trim too rich (bank 1)P2101Throttle actuator control motor circuit range / performanceP2135Throttle / pedal position sensor A/B voltage correlationP2138Throttle / pedal position sensor D/E voltage correlationP2187System too lean at idle (bank 1)P2188System too rich at idle (bank 1)P2195Oxygen sensor signal stuck lean (bank 1, sensor 1)P2279Intake air system leakP2463Diesel particulate filter – soot accumulation (bank 1)P242FDiesel particulate filter – ash accumulation (bank 1)P20EESCR NOx catalyst efficiency below threshold (bank 1)P20E8Reductant (AdBlue) pressure too lowP2BADNOx exceedance – root cause unknownP2563Turbocharger boost control position sensor A range / performance
Chassis and ABS (C)
Network (U)
U0001High-speed CAN communication busU0073Control module communication bus A offU0100Lost communication with engine control moduleU0101Lost communication with transmission control moduleU0121Lost communication with ABS control moduleU0140Lost communication with body control module (BCM)U0155Lost communication with instrument cluster