Oxygen Sensor: Service and Repair

REMOVAL
Upstream 1/1
1. Raise and support vehicle.
2. Unplug sensor connector.

Fig.31 Upstream Heated Oxygen Sensor Removal/Installation:

3. Remove sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equivalent.
4. After removing the sensor, the exhaust manifold threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite(R) 771-64 or equivalent.

Downstream 1/2

Fig.32 Downstream Heated Oxygen Sensor:

The downstream heated oxygen sensor threads into the exhaust outlet pipe behind the catalytic convertor.
1. Raise vehicle.
2. Disconnect electrical connector from harness.
3. Disconnect sensor electrical harness from clips along body.

Fig.33 Downstream Heated Oxygen Sensor Removal/Installation:

4. Remove sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equivalent.
5. After removing the sensor, the exhaust manifold threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite(R) 771-64 or equivalent.

INSTALLATION
Upstream 1/1
New sensors have compound on the threads and do not require an additional coating.
1. Install sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equivalent. Tighten the sensor to 28 Nm (20 ft. lbs.) torque.
2. Plug sensor connector.
3. Lower vehicle.

Downstream 1/2
The downstream heated oxygen sensor threads into the exhaust outlet pipe behind the catalytic convertor.

New sensors have compound on the threads and do not require an additional coating.
1. Install sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equivalent. Tighten the sensor to 28 Nm (20 ft. lbs.) torque.
2. Connect sensor electrical harness from clips along body
3. Connect electrical connector to harness.
4. Lower vehicle.