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Help with OBD2 Codes P1559, P0123, and P0303 for 1998 Volkswagen Passat

Model: 1998 Volkswagen Passat Fault Code: P1559 Posted: 2010-01-07 11:32

Hi everyone, I own a 1998 Volkswagen Passat and need help interpreting these OBD2 diagnostic codes: P1559, P0125, and P0303. Specifically, I'm concerned about P1559 as it appears to be related to idle speed control. Could someone please explain what each code means in the context of a 1998 VW Passat? I'd like to understand the underlying causes so I can take appropriate action. Thanks, Joel

Related fault codes

P1559

Comments (3)

Anonymous 2010-01-08 07:56

P1559 = Idle Speed Control Throttle Position Adaptation Malfunction. P0123 = Throttle/Pedal Position Sensor A Circuit High Input. P0303 = Cylinder 3 Misfire Detected.

Anonymous 2010-01-08 08:14

Thank you for the explanation. Are these repairs likely to be expensive?

Anonymous 2010-01-08 16:51

It depends on many variables — this forum is focused on technical explanations, not cost estimates. We cannot accurately determine repair costs without knowing specific labor rates, part availability, and vehicle condition. Without identifying the root cause of the codes, it's impossible to provide a reliable estimate for repairs.