Tools Required

J 39194 Oxygen Sensor Wrench

Notice: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.

1. Turn OFF the ignition switch.
2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.
3. Disconnect the HO2S electrical connector tab from the HO2S 1 retaining clip .
4. Remove the HO2S electrical connector retainer.
5. Remove the HO2S retaining clip from the bracket.

Caution: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.

6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.




Important: Remove the oxygen sensors (2) with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.

7. Remove the rear oxygen sensor from the rear exhaust manifold carefully using the J 39194 .

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.

Important: A special anti-seize compound is used on the oxygen sensor (1) 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. Install the rear oxygen sensor in the rear exhaust manifold.

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




2. Lower the vehicle.
3. Connect the electrical connector (3) to the HO2S.
4. Connect the HO2S electrical connector tab to the bracket.
5. Install the HO2S electrical connector retainer.
6. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.