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OBD-II code lookup
Search common generic OBD-II (P) fault codes by number or keyword. A starting point for diagnosis, not a substitute for it.
65 codes
P0010Camshaft position actuator circuit (bank 1)
P0011Camshaft position over-advanced (bank 1)
P0016Crankshaft / camshaft position correlation (bank 1)
P0030Oxygen sensor heater control circuit (bank 1, sensor 1)
P0070Ambient air temperature sensor circuit
P0087Fuel rail / system pressure too low
P0101Mass air flow (MAF) sensor circuit range/performance
P0102Mass air flow (MAF) sensor circuit low input
P0113Intake air temperature sensor circuit high input
P0117Engine coolant temperature sensor circuit low
P0120Throttle position sensor / switch A circuit
P0128Coolant thermostat below regulating temperature
P0130Oxygen sensor circuit (bank 1, sensor 1)
P0133Oxygen sensor slow response (bank 1, sensor 1)
P0135Oxygen sensor heater circuit (bank 1, sensor 1)
P0171System too lean (bank 1)
P0172System too rich (bank 1)
P0174System too lean (bank 2)
P0175System too rich (bank 2)
P0190Fuel rail pressure sensor circuit
P0201Injector circuit / open — cylinder 1
P0217Engine over-temperature condition
P0220Throttle position sensor / switch B circuit
P0234Turbocharger / supercharger overboost condition
P0299Turbocharger / supercharger underboost
P0300Random / multiple cylinder misfire detected
P0301Cylinder 1 misfire detected
P0302Cylinder 2 misfire detected
P0303Cylinder 3 misfire detected
P0304Cylinder 4 misfire detected
P0305Cylinder 5 misfire detected
P0306Cylinder 6 misfire detected
P0320Ignition / distributor engine speed input circuit
P0327Knock sensor 1 circuit low (bank 1)
P0335Crankshaft position sensor A circuit
P0340Camshaft position sensor A circuit (bank 1)
P0341Camshaft position sensor A range/performance (bank 1)
P0401Exhaust gas recirculation (EGR) flow insufficient
P0402Exhaust gas recirculation (EGR) flow excessive
P0411Secondary air injection system incorrect flow
P0420Catalyst system efficiency below threshold (bank 1)
P0430Catalyst system efficiency below threshold (bank 2)
P0440Evaporative emission (EVAP) system malfunction
P0442EVAP system small leak detected
P0446EVAP vent control circuit malfunction
P0455EVAP system large leak detected
P0456EVAP system very small leak detected
P0500Vehicle speed sensor A malfunction
P0505Idle air control system malfunction
P0521Engine oil pressure sensor range/performance
P0562System voltage low
P0563System voltage high
P0571Brake switch A circuit
P0600Serial communication link malfunction
P0606ECM / PCM processor fault
P0700Transmission control system malfunction
P0703Brake switch B circuit (transmission)
P0715Input / turbine speed sensor circuit
P0720Output speed sensor circuit
P0730Incorrect gear ratio
P0741Torque converter clutch circuit performance / stuck off
P0750Shift solenoid A malfunction
P2002Diesel particulate filter (DPF) efficiency below threshold (bank 1)
P2096Post-catalyst fuel trim system too lean (bank 1)
P2463Diesel particulate filter — soot accumulation
How to use an OBD-II code
Read the code with a scanner, look it up here to see the system it points to, then work back to the cause — checking wiring, sensors and related parts before you replace anything. Note the code and your findings on the job so there is a clear record. You can capture the fault and the fix on a job card or a vehicle health check for the customer.
FAQ
Questions people ask
An OBD-II code is a standard fault code your car's diagnostics store when they detect a problem. Generic codes start with P0 and mean the same on any make. You read them with an OBD-II scanner plugged into the port under the dashboard.