Oxygen Sensor: Testing and Inspection

Oxygen Sensor Heater Inspection

1. Disconnect sensor coupler.





2. Using ohmmeter, measure resistance between terminals "VB" and "GND" of sensor coupler.

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

Resistance of oxygen sensor heater: 11.7 - 14.3 Ohms at 20°C, 68°F

If found faulty, replace oxygen sensor.
3. Connect sensor coupler securely.