Oxygen Sensor: Testing and Inspection

HEATED OXYGEN SENSORS INSPECTION

INSPECT HEATER RESISTANCE OF HEATED OXYGEN SENSORS
(a) Disconnect the heated oxygen sensor connector.





(b) Using an ohmmeter, measure the resistance between terminals +B and HT.

Resistance:
At 20°C (68°F):
Bank 1 Sensor 1:5 - 7 Ohms
Bank 1 Sensor 2:11 - 18 Ohms

If resistance is not as specified, replace the heated oxygen sensor.
(c) Reconnect the heated oxygen sensor connector.