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Home >> Subaru >> 2021 >> Crosstrek Hybrid >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 (Engine Control System (2.5L) (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

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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.

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