Notice: Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

Important: Remove oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.

Important: 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. Refer to Lifting and Jacking the Vehicle in General Information.
2. Support rear of powertrain frame.
3. Remove four rear frame bolts.
4. Lower the frame no more than 76 mm (3 inches).
5. Disconnect the rear oxygen sensor electrical connector.
6. Remove the rear oxygen sensor from the rear exhaust manifold.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.




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

Tighten
Tighten the rear heated oxygen sensor (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.

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

5. Lower the vehicle.