DTC P2270 O2 Sensor Signal Stuck Lean (Bank 1/Sensor 2): DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item	Detecting Condition	Possible cause
DTC Strategy	Monitor HO2S's signal	Poor Connection Faulty HO2S Clogging of fuel filter in fuel pump 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 < 0.35V and Air Fuel Ratio ≤ 13.5
Diagnosis Time	Continuous (More than 8 sec. failure for every 9 sec. Test)
MIL On Condition	2 Driving Cycles