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

DTC DETECTING CONDITION CHART

Item	Detecting Condition	Possible cause
DTC Strategy	Long term fuel trim (KLRN) & short term fuel trim (KI) are monitored.	Poor connection Intake system for leak Exhaust leak Defective injector Improper fuel line pressure Defective ECM
Enable Conditions	Closed loop
Threshold value	Idle - KLRN > +12.5%, KI > +25% Part load - KLRN > +12.5%, KI > +11.3%
Diagnosis Time	Continuous
MIL On Condition	2 driving cycles