Monitored & Set Conditions

1/1 Heated Oxygen Sensor (HO2S) voltage is monitored after ignition is turned off, 1/1 HO2S cools down, and after the next time ignition is turned on, provided that engine coolant temperature is less than 98°F (37°C) and ambient/battery temperature is within plus or minus 44°F of engine coolant temperature. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 1/1 HO2S voltage is less than .08 volt for 5 seconds after engine is started. Possible causes for DTC to set are: intermittent condition, defective 1/1 HO2S, defective PCM, or defective connectors or wiring.