Oxygen Sensor: Testing and Inspection

Heated Oxygen Sensor:

COMPONENTS

INSPECTION

1. INSPECT HEATER RESISTANCE OF HEATED OXYGEN SENSORS
a. Disconnect the oxygen sensor connector.




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

Resistance:
At 20 °C (68 °F) 11 - 16 Ohms
At 800 °C (1,472 °F) 23 - 32 Ohms

If the resistance is not as specified, replace the sensor.

Torque:
44 Nm (450 kg.cm, 32 ft.lb) for sensor 1
20 Nm (200 kg.cm, 14 ft.lb) for sensor 2

c. Reconnect the oxygen sensor connector.

2. INSPECT OPERATION OF HEATED OXYGEN SENSORS