Buick Regal: Diagnostic Information and Procedures

 DTC P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, or P2157

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors D

 Valve and Seat Grinding

Valve Measurement and Reconditioning Overview Proper valve service is critical to engine performance. Therefore, all detailed measurement procedures must be followed to identify components that are out of specification. If the measurement procedures reveal that the valve or valve seat must b