Oxygen Sensor: Service and Repair

REMOVAL

Upstream 1/1
1. Remove battery.
2. Remove the battery tray.
3. Disconnect the speed control vacuum harness from servo.
4. Disconnect the electrical connector from servo.
5. Remove the speed control servo and bracket and reposition.

Fig. 23 O2 Sensor 1/1:

6. Use a socket such as the Snap-On(R) YA8875 or equivalent to remove the sensor.
7. When the sensor is removed, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If using the original sensor, coat the threads with Loctite 771-64 anti-seize compound or equivalent.

Downstream 1/2
1. Disconnect the negative battery cable.
2. Raise and support the vehicle.

Fig. 24 Downstream Oxygen Sensor (1/2):

3. Disconnect the electrical connector.

Fig. 25 Downstream 2/1 O2 Sensor:

4. Use a socket such as the Snap-On(R) YA8875 or equivalent to remove the sensor.
5. When the sensor is removed, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If using the original sensor, coat the threads with Loctite 771-64 anti-seize compound or equivalent.

INSTALLATION

Upstream 1/1
The engines uses two heated oxygen sensors.
1. 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 771-64 or equivalent. New sensors have compound on the threads and do not require an additional coating.
2. Install sensor and tighten to 27 Nm (20 ft. lbs.).
3. Connect the electrical connector for the O(2) sensor and install onto bracket.
4. Connect the electrical connector for the speed control servo.
5. Install the speed control servo and bracket.
6. Connect the speed control vacuum harness to servo.
7. Install the battery tray.
8. Install battery.

Downstream 2/1
The O(2)S is located on the side of the catalytic converter.

Threads of new oxygen sensors are factory coated with anti-seize compound to aid in removal. DO NOT add any additional anti-seize compound to the threads of a new oxygen sensor.

1. Install sensor and tighten to 27 Nm (20 ft. lbs.).
2. Connect the electrical connector.
3. Lower vehicle.
4. Install the negative battery cable.