LEMON Manuals
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2020
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WRX STI
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Repair and Diagnosis (Single Page)
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Engine Performance
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System
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Engine Control System (Diagnostics) (2.5L) (4 Of 4)
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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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DTC P2271: O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2
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Execution Condition
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Execution Condition
Secondary parameters
Execution condition
Battery voltage
> 10.9 V
Time of fuel shut-off operation
>5000 ms
Estimated temperature of the rear oxygen sensor element
>500°C (932°F)