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Look up a fault code

A check engine light gives you a code, not an answer. Search or browse all9,533 generic OBD-II codes — every one has its own page with symptoms, likely causes and the parts involved.

Type at least two characters. Partial codes and wildcards (* and ?) work.

    Codes we see most

    These carry notes from our own bays on what the code usually means on an Alfa Romeo or a Ford EcoBoost.

    Browse every code

    All 9,533 codes, grouped by range. Every code has its own page.

    B0xxx — 323 codes

    Body codes — airbags, restraints, climate and interior systems.

    C0xxx — 626 codes

    Chassis codes — ABS, traction control, steering and suspension.

    P0xxx — 3,705 codes

    Generic powertrain codes — engine, fuel, ignition, emissions and transmission.

    P2xxx — 3,495 codes

    Generic powertrain codes — injector, sensor and emissions circuits.

    P3xxx — 155 codes

    Generic powertrain codes — ignition and misfire related.

    U0xxx — 1,055 codes

    Network and communication codes — modules losing contact with each other.

    U3xxx — 174 codes

    Network codes — control module software and configuration.