DTC P2271 O2 Sensor Signal Stuck Rich (Bank 1/2 Sensor 1): DTC Detecting Condition

DTC DETECTING CONDITION

Item	Detecting Condition	Possible Cause
DTC Strategy	Plausibility check during shift of lambda set point to rich or lean	Three Way Catalytic Converter (TWC) Restriction in exhaust system Rear HO2S
Enable Conditions	No fuel cut-off No full load phase No fuel trim error detected Delay time to start diagnosis: 13 ~ 30 sec, depending on operation point 11V < Battery voltage < 16V No relevant failure
Threshold Value	Rear HO2S signal > 0.2 V when lambda set point = 1.15
Diagnostic Time	30 sec.
Fail Safe