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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Control System (Diagnostics) (P000A To P015B) (H4DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P015A A/F/O2 Sensor Delayed Response - Rich To Lean Bank 1 Sensor 1 >> Diagnostic Method 2

Diagnostic Method 2

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Detect the malfunction by calculating the average amplitude of λ.

Fig 1: Malfunction Indicator Light Illumination Graph
G08540817Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value DTC
Average value for λ amplitude > 0.07 (AT model)
> 0.07 (MT model)
P015A and P015B

Time needed for diagnosis:  70000ms

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.