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.
Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.Important:
• Remove oxygen sensors with the engine temperature above 48°C (120°F).
Otherwise the oxygen sensors may be difficult to remove. • 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 GM P/N 5613695
or equivalent.
Removal Procedure
- Turn OFF the ignition.
- Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.
- Remove the HO2S retaining clip (4) from the bracket (1).
- Disconnect the HO2S electrical connector tab (3) from the HO2S 1 retaining clip (4).
- Remove the HO2S electrical connector retainer.
- Raise and support the vehicle.
- Use the J 39194 in order to carefully remove the rear oxygen sensor (1) from the rear exhaust manifold .
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.
Installation Procedure
- Install the rear oxygen sensor (1) in the rear exhaust manifold.
- Connect the electrical connector (3) to the HO2S (4).
- Connect the electrical connector tab (4) to the bracket (1).
- Install the HO2S electrical connector retainer.
- Lower the vehicle.
- Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.
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.
Tighten
Tighten the sensor to 41 N·m (30 lb ft).
