Upper O2 Sensor

REMOVAL
The engines uses two heated oxygen sensors.

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

1. Disconnect negative battery cable.

O2 Sensor Connector:

2. Disconnect the upper O2 sensor connector.

Upstream O2 Sensor:

3. Use a socket such as Snap-On YA8875 or a crow foot wrench to remove oxygen sensor.

INSTALLATION

NOTE: When replacing an O2 Sensor, the PCM RAM memory must be cleared, either by disconnecting the PCM C-1 connector or momentarily disconnecting the Battery negative terminal. The NGC learns the characteristics of each O2 heater element and these old values should be cleared when installing a new O2 sensor. The customer may experience driveability issues if this is not performed.

Upstream O2 Sensor:

1. After removing the sensor, the 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 N.m (20 ft. lbs.) torque.

O2 Sensor Connector:

2. Connect the heated oxygen sensor electrical connector.
3. Connect the negative battery cable.