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.Removal Procedure
- Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical 3.8L.
- Remove the heated oxygen sensor (HO2S) electrical CPA retainer.
- Disconnect the HO2S wiring harness connector (3) from the HO2S electrical connector (4).
- Remove the HO2S electrical connector (4) from the fuel injector sight shield bracket (1).
- Use the J 39194 to remove the HO2S (2).
Notice: The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe.
Important: Remove the oxygen sensor with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
Installation Procedure
- Install the rear oxygen sensor in the right exhaust manifold.
- Connect the HO2S electrical connector (4) to the wiring harness connector (3).
- Install the HO2S electrical connector (4) to the fuel injector sight shield bracket (1).
- Install the HO2S electrical CPA retainer.
- Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical-3.8L.
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 12377953 or equivalent.
Tighten
Use the J 39194
to tighten the HO2S
to 41 N·m (30 lb ft).
