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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2.5L) - Introduction >> Drive Cycle >> Procedure >> Drive Cycle V

Drive Cycle V

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DTC Item Condition Number of driving cycles on the detecting condition
P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 1 - 2
WARNING: When performing the drive cycle V on the public road, be very careful of the traffic condition and the safe driving must be the high priority.
  1. Drive according to the drive pattern described below.
    G13650070Courtesy of SUBARU OF AMERICA, INC.
    NOTE:
    • Acceleration and constant speed conditions may be adjusted depending on road conditions.
    • If a diagnostic value is not input after driving, do not stop the engine and repeat the procedure (C) again.
  2. Read the temporary code using the Subaru Select Monitor or general scan tool. Refer to ENGINE (DIAGNOSTICS) (STI)>READ DIAGNOSTIC TROUBLE CODE (DTC)>OPERATION .
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