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2021
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WRX Base
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System (Diagnostics) (2.0L) (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
Execution Condition
Secondary parameters
Execution condition
Battery voltage
≥ 10.9 V
Time of fuel shut-off operation
≥ 5 s
Estimated temperature of the rear oxygen sensor element
≥ 450°C (842°F)