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Code guides

Common fault codes, explained from the dictionary.

Each guide shows the dictionary meaning with a link to its source, manufacturer-specific entries where the dictionary has them, related codes and plain-language terms. We do not guess repair costs or say whether a car is safe to drive.

  • P0420

    Catalyst System Efficiency Below Threshold Bank 1

  • P0430

    Catalyst System Efficiency Below Threshold Bank 2

  • P0171

    System Too Lean Bank 1

  • P0174

    System Too Lean Bank 2

  • P0300

    Random/Multiple Cylinder Misfire Detected

  • P0301

    Cylinder 1 Misfire Detected

  • P0302

    Cylinder 2 Misfire Detected

  • P0303

    Cylinder 3 Misfire Detected

  • P0304

    Cylinder 4 Misfire Detected

  • P0011

    A Camshaft Position - Timing Over-Advanced or System Performance Bank 1

  • P0016

    Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A

  • P0128

    Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

  • P0455

    EVAP System Leak Detected - Large Leak

  • P0456

    EVAP System Leak Detected (very small leak)

  • P0442

    EVAP System Leak Detected (small leak)

  • P0101

    Mass or Volume Air Flow Sensor A Circuit Range/Performance

  • P0135

    O2 Sensor Heater Circuit Bank 1 Sensor 1

  • P0401

    EGR A Flow Insufficient Detected

  • P0507

    Idle Control System RPM - Higher Than Expected

  • P1086

    Manufacturer-specific: BMW, Subaru