DTC P0154 Ho2S Circuit No: Activity Detected (Bank 2/Sensor 1): DTC Detecting Condition

DTC DETECTING CONDITION

Item		Detecting Condition	Possible Cause
(Case1)	DTC Strategy	Signal plausibility during fuel cut off	Related fuse blown or missing Contact resistance in connectors HO2S contamination
	Enable Conditions	Sensor preheating and full heating phases finished Fuel Cut Off active Integrated Mass Air Flow since begin fuel cut-off > 20g
	Threshold Value	Voltage with fuel cut off > 0.2V
	Diagnostic Time	5 Sec.
(Case2)	DTC Strategy	Sensor voltage excursion
	Enable Conditions	Sensor preheating and full heating phases finished 5 Cycles of A/F Closed Loop passed after lambda control active. Lambda controller is not on the limit Battery voltage > 10V
	Threshold Value	Sensor voltage < 0.25V
	Diagnostic Time	2 min.
MIL On Condition		2 Driving Cycles