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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 P013A O2 Sensor Slow Response - Rich To Lean Bank 1 Sensor 2 >> Diagnostic Method

Diagnostic Method

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Detect the trouble by calculating the response time of the rear oxygen sensor during fuel cut.

Fig 1: Rear Oxygen Sensor Diagnostic Parameter Graph
G11272729Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Time needed for rear oxygen sensor voltage to change from 0.5 V to 0.2 V > 491ms

Time needed for diagnosis:  5000ms

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