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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 P1818:

Citroen/Peugeot:

Transmission Neutral Safety Switch Short Circuit To Battery

Ford:

Transmission Neutral Safety Switch Short Circuit To Battery

GM:

TFP Valve Position Sw. - Drive Without Drive Ratio

Porsche:

Pressure regulator 2

Volkswagen/Audi:

Pressure Contr. Solenoid 2 Electrical

Volvo:

Pressure Contr. Solenoid 2 Electrical