Upstream 1/1, 2/1 2.7L
REMOVALO2 Sensors 2.7L:
The engines uses two heated oxygen sensors, one in each exhaust manifold.
CAUTION: When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
1. Remove the negative battery cable.
2. Remove the air cleaner box for the rear O2 sensor.
3. Disconnect the heated oxygen sensor electrical connector.
4. Use a Special tool #8439 to remove oxygen sensor.
INSTALLATION
The engines uses two heated oxygen sensors, one in each exhaust manifold.
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. Use a Special tool #8439 to install oxygen sensor. Tighten the sensor to 28 Nm (20 ft. lbs.) torque.
3. Connect the heated oxygen sensor electrical connector.
4. Install the air cleaner box.
5. Install the negative battery cable.