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Home >> Subaru >> 2021 >> Ascent Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0458: EVAP System (CPC) Purge Control Valve "A" Circuit Low >> General Description >> General Driving Cycle

General Driving Cycle

Always perform the diagnosis after starting the engine.