LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2012 >> Forester X, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DO) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0140 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2) >> Diagnostic Method
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Method

JUDGMENT VALUE REFERENCE CHART

Malfunction Criteria Threshold Value
Minimum output voltage > 0.15 V
or  
Maximum output voltage < 0.55 V

Time Needed for Diagnosis:  200000 ms

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

JUDGMENT VALUE REFERENCE CHART

Malfunction Criteria Threshold Value
Diagnosis of the rear oxygen sensor voltage low side Incomplete
Minimum output voltage ≤ 5 0.15 V
Maximum output voltage ≥ 0.55 V