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Home >> Subaru >> 2008 >> Forester XT, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0140 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2) >> Diagnostic Method

Diagnostic Method

Abnormality Judgment 

When the following conditions are established, it is NG.

Judgment Value 

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
Maximum output voltage, low side < 550 mV
Minimum output voltage, high side > 250 mV

Time Needed for Diagnosis:  200 seconds

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment 

When the following conditions are established, it is OK.

Judgment Value 

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
Maximum output voltage, low side ≥ 550 mV
Minimum output voltage, high side ≤ 250 mV