Monitored & Set Conditions

1/2 Heated Oxygen Sensor (HO2S) voltage is monitored after engine has been running for 119 seconds, engine coolant temperature is less than 176°F (80°C) and vehicle speed is more than 40 MPH. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/2 HO2S voltage is less than .08 volt for 61 seconds after engine is started. Possible causes for DTC to set are: intermittent condition, defective 1/2 HO2S, defective PCM, or defective connectors or wiring.