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Home >> Subaru >> 2017 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (P2101 To U0423) (2.5L) >> 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 ≥ 10 g/s (0.35 oz/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 0.55 V ≥ 15000 ms
Air fuel ratio reduced from target air fuel ratio = Value of Map

Map 

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