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OBDII/EOBD diagnostics trouble codes definition

If your car supports OBD II or EOBD, then you can already use almost 5000 generic OBDII codes. These codes are from PowerTrain series (P0XXX, P2XXX, P34XX), Body Series (B0XXX), Chassis series (C0XXX), Network series (U0XXX, U2XXX, U3XXX).

Also there is a list of more than 13500 additional manufacturer specific codes.

Supported manufacturers with specific OBD2 codes:


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Definition of check engine code P1231:

Citroen/Peugeot:

Fuel Pump Secondary Circuit Low, High Speed

Daewoo:

FUEL PUMP RELAY FLT(PWR SHT)

Ford:

Fuel Pump Secondary Circuit Low, High Speed

GM:

Injector Circuit Cylinder 4 Intermittent

Lincoln:

High Speed Fuel Pump Relay Activated

Mercury:

High Speed Fuel Pump Relay Activated

Oldsmobile:

High Speed Fuel Pump Relay Activated

Opel:

Fuel pump relay

Volkswagen/Audi:

Cyl.7 - Fuel Inj. Circ. Short to Ground

Volvo:

Cyl.7 - Fuel Inj. Circ. Short to Ground