LaCrosse V6-3.8L (2009)
Oxygen Sensor: Service and Repair
Heated Oxygen Sensor Replacement - Sensor 1
Heated Oxygen Sensor Replacement - Sensor 1
Special Tools
J 39194 Oxygen Sensor Wrench
Removal Procedure
Caution: 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.
Caution: 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.
1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (See: Fuel Delivery and Air Induction/Fuel
Injector/Service and Repair/Removal and Replacement/Fuel Injector Sight Shield Replacement).
2. Remove the heated oxygen sensor (HO2S) retaining clip.
3. Disconnect the HO2S electrical connector (1).
4. Remove the HO2S electrical connector (1) from the fuel injector sight shield bracket.
Note: Remove the oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
5. Use the J 39194 to remove the HO2S (2) from the right exhaust manifold.
Installation Procedure
