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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 P1721:

Chrysler/Dodge/Jeep:

Line Pressure Sensor Circuit (old)

Citroen/Peugeot:

Gear 1 Incorrect Ratio

Daewoo:

CONTROL RELAY

Ford:

Gear 1 Incorrect Ratio

Lincoln:

Gear 1 Incorrect Ratio

Mercedes:

Gear 1 Incorrect Ratio

Mercury:

Gear 1 Incorrect Ratio

Oldsmobile:

Gear 1 Incorrect Ratio

Volkswagen/Audi:

Wheel Speed Signal 3 Range / Performance

Volvo:

Wheel Speed Signal 3 Range / Performance

GM:

Solenoid "B" Controlled Clutch Not Engaged