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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (P2101 To U171F) (H4DOTC) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P2271 O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 >> Diagnostic Method

Diagnostic Method

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Output voltage of rear oxygen sensor > 0.15 V

Time needed for diagnosis:  0.5 s

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

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