Buick Regal Owners & Service Manuals

Buick Regal: Diagnostic Information and Procedures

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 DTC C0393

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. Diag

 DTC C0407

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. Diag

 DTC C1230 or C1231

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. Diag

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 DTC P0521, P0522, or P0523

DTC Descriptors DTC P0521 Engine Oil Pressure Sensor Performance DTC P0522 Engine Oil Pressure Sensor Circuit Low Voltage. DTC P0523 Engine Oil Pressure Sensor Circuit High Voltage Diagnostic Fault Information 1. Engine Oil Pressure Indicator Malfunction Circuit/System Description The engine oil pr

 DTC B0014, B0021, B0031, or B0038

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

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