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Home >> Subaru >> 2017 >> Legacy 2.5i Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Control System (Diagnostics) (P000A To P015D) (H6DO)) >> 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: Identifying Average Amplitude
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 > 0.06 A pair of P015A/P015B and a pair of P015C/P015D are diagnosed respectively.

Time Needed for Diagnosis:  90000 ms

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.