OEM 2004 Buick LeSabre Oxygen Sensor

2004 Buick LeSabre Parts Questions & Experts Answers

• Q: What tools are required to replace the Heated Oxygen Sensor (HO2S) 1, and what are the steps involved in the process on 2004 Buick LeSabre?

  A: The replacement of heated Oxygen Sensor (HO2S) 1 necessitates the use of an Oxygen Sensor wrench (J 39194) as tool. Start by taking off the fuel injection sight shield and switch off ignition. First remove the retaining clip from its bracket then disconnect the ho2s electrical connector tab from the clip before you remove the electrical connector retainer. Lift the vehicle and maintain engine temperatures above 120°f (48°C) so that you can safely remove the oxygen sensors. The Oxygen Sensor wrench (J 39194) should be used to extract the rear Oxygen Sensor from the rear Exhaust Manifold. Make sure to apply special anti-seize compound to new service sensor threads or coat previously used sensor threads with anti-seize compound p/n 5613695 or equivalent for installation purposes. The rear Oxygen Sensor must go into the rear Exhaust Manifold where it needs a torque of 41 n.m (30 lb ft). Connect the electrical connector to the ho2s before you attach the ho2s electrical connector tab to the bracket followed by installing the electrical connector retainer while also reinstalling the fuel injection sight shield.