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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 P1812:

Citroen/Peugeot:

Transmission 4-Wheel Drive Mode Select Circuit Failure

Ford:

Transmission 4-Wheel Drive Mode Select Circuit Failure

GM:

Transmission Over Temperature Condition

Lincoln:

Transmission 4-Wheel Drive Mode Select Circuit Failure

Mercury:

Transmission 4-Wheel Drive Mode Select Circuit Failure

Oldsmobile:

Transmission 4-Wheel Drive Mode Select Circuit Failure