Oxygen Sensor: Testing and Inspection

HEATED OXYGEN SENSOR (Sensor-1 and Sensor-2)

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 - 15.6ohms at 20°C, 68°F.

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