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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 P013B O2 Sensor Slow Response - Lean To Rich 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 after fuel cut.

Fig 1: Rear Oxygen Sensor Diagnostic Parameter Graph
G11272731Courtesy 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 0.3 V to 0.5 V > 4000ms

Time needed for diagnosis:  Less than 1 second

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.