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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 P1661:

Chrysler/Dodge/Jeep:

Sensor Ground Reference Circuit

Citroen/Peugeot:

Output Circuit Check Signal Low

Ford:

Output Circuit Check Signal Low

GM:

MIL Control Circuit

Lincoln:

Output Circuit Check Signal Low

Mercury:

Output Circuit Check Signal Low

Oldsmobile:

Output Circuit Check Signal Low

Scion:

EGR Circuit.

Toyota:

EGR Circuit Malfunction

Volkswagen/Audi:

Engine coolant blower motor,speed 2 - short to positive