DTC P0171 System Too Lean (Bank 1): DTC Detecting Condition

DTC DETECTING CONDITION AND POSSIBLE CAUSE

Item		Detecting Condition	Possible Cause
DTC Strategy	Case1)	Monitoring deviation of fuel trim control (Long term)	Three Way Catalytic Converter (TWC) Rear HO2S
DTC Strategy	Case2)	Monitoring deviation of fuel trim control (Short term)
Enable Conditions	Case1)	No relevant failure Long term fuel trim active
Enable Conditions	Case2)	No relevant failure Short term fuel trim active Canister load < 1 Engine Coolant temperature > 70°C
Threshold Value		Short or Long term fuel trim > +25% or < -25%
Diagnostic Time		60 sec.
Mil On Condition		2 Driving Cycles