Oxygen Sensor: Service and Repair

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

Fig. 21 O2 Sensor Upstream 1/1 - 3.3/3.8L:

3. Disconnect the electrical connector.
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 O2 sensor and install onto bracket.
4. Lower vehicle.
5. Connect the negative battery cable.

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.