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Home >> Subaru >> 2020 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (2.5L) (4 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P2270: O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 >> Execution Condition
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Execution Condition

Secondary parameters Execution condition
Battery voltage ≥ 10.9 V
Sub feedback In operation
Amount of intake air ≥10g/s (0.35oz/s)
Estimated temperature of the rear oxygen sensor element ≥500°C (932°F)
Enable conditions at interrupt control are as follows
Continuous time when rear oxygen sensor output voltage is less than 0.55V
≥15000 ms
Air fuel ratio reduced from target air fuel ratio = Value of Map
MAP SPECIFICATION

Output voltage of rear oxygen sensor (V) 0.00 0.15 0.20 0.40 0.60
Air fuel ratio reduced from target air fuel ratio (%) 15 15 4 4 4