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Home >> Subaru >> 1995 >> Impreza Outback, 2.2 4 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Code Testing (OBD II - 2.2L) >> DTC P0139 (RO2_R) - Rear Oxygen Sensor (O2S) Circuit Slow Response

DTC P0139 (RO2_R) - Rear Oxygen Sensor (O2S) Circuit Slow Response

IF DTC P0136 is displayed, perform DTC P0136 testing, clear codes and retest. If DTC P0136 is not displayed, replace rear O2S.

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