Bank 1 Sensor 1

REMOVAL PROCEDURE

NOTE:
^ Remove oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
^ Take care when handling oxygen sensors. The electrical connector and louvered end must be kept free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.
^ A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.

1. Raise and support the vehicle.
2. Support rear of powertrain frame.
3. Remove four rear frame bolts (#2 and #3 locations).
4. Lower the frame no more than 3 inches.
5. Disconnect the rear oxygen sensor connector.
6. Remove the rear oxygen sensor from the rear exhaust manifold.

INSTALLATION PROCEDURE

NOTE: Refer to Fastener Notice in Service Precautions.

1. Install the rear oxygen sensor in the rear exhaust manifold.

Tighten
Tighten the rear HO2S sensor to 41 N.m (30 lb ft).

2. Connect the rear oxygen sensor connector.
3. Raise the frame.
4. Install the four rear frame bolts (#2 and #3 locations).

Tighten
Tighten the frame bolts to 100 N.m (74 lb ft).

5. Lower the vehicle.