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

DTC DETECTING CONDITION CHART

Item	Detecting Condition	Possible cause
DTC Strategy	Monitor HO2S's signal	Poor Connection Faulty HO2S Faulty PCM
Enable Conditions	Battery voltage ≥ 10V Engine running ≥ 60sec. Power Enrichment conditions Engine warm-up state Not in Transient Conditions
Threshold value	HO2S's signal > 0.42V
Diagnosis Time	Continuous (More than 8 sec. failure for every 9 sec. Test)
MIL On Condition	2 Driving Cycles