Monitored & Set Conditions

Circuit is monitored with engine running, coolant temperature greater 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 the O2 sensor is switching from less than 0.39 volt to greater than 0.6 volt and back fewer times than required.