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Home >> Subaru >> 2021 >> Forester Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2 Of 4) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P0420: Catalyst System Efficiency Below Threshold Bank 1 >> General Description >> General Driving Cycle

General Driving Cycle

When the TWC, the A/F sensor, and the rear oxygen sensor are fully warmed up, perform diagnosis if the following operations are experienced once respectively: a 10-second idling after the deceleration fuel cut for the predetermined time or longer, and a 10-second driving with the accelerator ON after the deceleration fuel cut for the predetermined time or longer.