Upstream Heated Oxygen Sensors

Fig 59 Heated Oxygen Sensor Removal/Installation:

NOTE: This engine uses two heated oxygen sensors, one in each exhaust manifold.

WARNING: The exhaust manifold, exhaust pipes and catalytic converter become very hot during engine operation. Allow engine to cool before removing oxygen sensor.

CAUTION: When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.

REMOVAL
1. Disconnect the heated oxygen sensor electrical connector.
2. Use a socket such as Snap-On YA8875 or a crow foot wrench to remove oxygen sensor (Fig. 59).

INSTALLATION
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.
- Tighten the sensor to 28 Nm (20 ft. lbs.) torque.
2. Connect the heated oxygen sensor electrical connector.