Heated Oxygen Sensor Heater On-Vehicle Inspection

1. Disconnect HO2S-1 or-2 coupler.




2. Using ohmmeter, measure resistance between terminals "VB" and "GND" of HO2S coupler (1).
If found faulty, replace HO2S.

NOTE: Temperature of HO2S affects resistance value largely. Make sure that HO2S heater is at correct temperature.

3. Connect HO2S coupler securely.