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Home >> Subaru >> 2005 >> Outback R VDC Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO U5 (PZEV))) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2) >> Diagnostic Method >> Normality Judgment

Normality Judgment

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  1. Judge Normal when the response time (diagnostic value) is smaller than threshold (judgment value) when changing to lean since O2 sensor voltage.
  2. A normal judging is not carried out.

Judgment Value 

Judge OK when the following standards value are completed.

JUDGMENT VALUE

Malfunction Criteria Threshold Value
Change of the shortest time from rich (500 mV O2 output), when voltage decreases from 550 mV to 250 mV to lean (300 mV). </= 0.698 seconds


  1. Judge Normal when the response time (diagnostic value) is smaller than threshold (judgment value) when changing to lean since O2 sensor voltage.

    Response Time (diagnosis value) > Threshold value --> Normal

  2. A normal judging is not carried out.

Judgment Value 

Judge OK when the following standards value are completed.

JUDGMENT VALUE

Malfunction Criteria Threshold Value
Change of the shortest time from rich (300 mV O2 output), when voltage decreases from 550 mV to 250 mV to lean (500 mV). </= 2 seconds