DTC P0172: System Too Rich (Bank 1): DTC Detecting Condition

DTC DETECTING CONDITION

Item	Detecting Condition	Possible Cause
DTC Strategy	Monitoring deviation of lambda controller	Restricted intake or exhaust system Dirty engine oil or oil level too high Front HO2S or MAFS contamination Over purging of the EVAP system High fuel pressure Faulty sensor signals
Enable Condition	No relevant failure Estimated fuel dilution in oil limited is in rich side
Threshold Value	Lambda controller+Trim value < - 23%(SULEV), -18% (ULEV) The above condition is met for more than 60 sec. within 180 sec.
Diagnostic Time	60 seconds
Fail Safe	EVAP. Emission control function is controlled in minimum operation mode