P0170 O2 Sensor System - Lambda Controller at the Limit (Bank 1): DTC Detecting Condition

Item	Detecting Condition	Possible Cause
DTC Strategy	Monitoring deviation of lambda controller	Air leakage or restriction in intake or exhaust system Dirty engine oil or oil level too high Front HO2S or MAFS contamination Fuel system EVAP system Faulty sensor signals
Enable Condition	Lambda control active Coolant temperature > 70°C (158°F) No relevant failure 10 < Battery voltage < 16
Threshold Value	Lambda controller -30%/+50%
Diagnostic Time	30 seconds
Mil On Condition	2 Driving Cycles