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A P0455 diagnostic code indicates a gross leak in the EVAP system. Learn possible causes, symptoms, and troubleshooting tips for P0455.

A P0128 diagnostic code indicates the coolant temperature is below normal. Learn possible causes, symptoms, and troubleshooting tips for P0128.

A P0300 diagnostic code indicates a random cylinder misfire. Learn possible causes, symptoms, and troubleshooting tips for P0300.

A P0456 diagnostic code indicates a small leak in the EVAP system. Learn possible causes, symptoms, and troubleshooting tips for P0456.

A P0171 diagnostic code indicates that the fuel trim system is too lean. Learn possible causes, symptoms, and troubleshooting tips for P0171.

A P0420 diagnostic code indicates catalyst system efficiency issues. Learn possible causes, symptoms, and troubleshooting tips for P0420.

Learn how to read and interpret OBD diagnostic trouble codes. Our comprehensive library covers standard OBD2 and manufacturer-specific codes.