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Home >> Subaru >> 2005 >> Outback R VDC Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0139 02 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 REFERENCE (NORMALITY)

Malfunction Criteria Threshold Value
Change of the shortest time from rich (500 mV 02 output), when voltage decreases from 550 mV to 250 mV to lean (300 mV). </= 0.510 seconds


  1. Judge Normal when the response time (diagnostic value) is smaller than threshold (judgment value) when changing to lean since 02 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 REFERENCE (NORMALITY)

Malfunction Criteria Threshold Value
Change of the shortest time from rich (300 mV 02 output), when voltage decreases from 550 mV to 250 mV to lean (500 mV). >/= 2 seconds