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.

Important: Take care when handling the heated oxygen sensor. The in-line electrical connector and louvered end must be kept free of grease, dirt or other contaminants. Also, avoid using cleaning solvents of any type. Do not drop or roughly handle the heated oxygen sensor/catalyst monitor. A dropped sensor is a bad sensor.

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

Notice: 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.

Notice: 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.

J 39194 Oxygen Sensor Wrench

1. Remove the HO2S retaining clip (4) from the bracket (1).
2. Disconnect the HO2S electrical connector tab (3) from the HO2S1 retaining clip (4).
3. Remove the HO2S electrical connector retainer.



4. 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.

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

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




2. Connect the HO2S electrical connector (3) to the HO2S (4).
3. Connect the HO2S electrical connector tab (4) to the bracket (1).
4. Install the HO2S electrical connector retainer.

Caution: Provide additional support when a vehicle is on a hoist:

•	Before removing parts, support the opposite end. This helps prevent the vehicle from slipping off.

•	Before removing major components, chain the vehicle frame to the hoist pads at the same end as the removal. This helps avoid a tip-off.

Failure to follow these precautions could cause vehicle damage, serious personal injury, or death.

Important: The heated oxygen sensor may be difficult to remove when engine temperature is below 48°C (120°F). Excessive force may damage threads in exhaust manifold or exhaust pipe.

1. Raise and support the vehicle.



2. Remove the splash shield (3).
3. Disconnect the HO2S electrical connector retaining tab (1) from the HO2S electrical connector (2).
4. Disconnect the oxygen sensor connector (4) from the HO2S electrical connector (2).
5. Remove the oxygen sensor (4) from the exhaust pipe 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.




1. Install the oxygen sensor (4) in to the exhaust pipe.

Tighten
Tighten the oxygen sensor to 41 N·m (30 lb ft).

2. Connect the HO2S (4) electrical connector to the HO2S electrical connector (2).
3. Connect the HO2S electrical connector HO2S retaining tab (1).
4. Install the front splash shield (3).
5. Lower the vehicle.