Monitored & Set Conditions

Circuit is monitored with engine running, coolant temperature more than 158°F (70°C), open throttle, vehicle speed steady or slightly increasing between 18 and 55 MPH and engine under light load for at least 5 minutes. DTC will set if PCM senses 1/1 HO2S is switching from less than .39 volt to more than .6 volt and back fewer times than required.