Don't think yours will have a MAP sensor. It will have a MAF sensor, and it is attached to the air filter housing.
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To replace the airbag sensor on a 2005 Buick LeSabre, first ensure the vehicle is turned off and the battery is disconnected to prevent accidental deployment. Locate the airbag sensor, which is typically found under the front seats or near the steering column. Remove the sensor's electrical connector and unscrew it from its mounting bracket. Install the new sensor by reversing the removal process, reconnecting the electrical connector, and reconnecting the battery before testing the airbag system.
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When I had that problem on my 1997 buick lesabre, I had to replace the catalyst converter and the 02 sensor on it. It resolved the issue with the code.
It was $150 at the dealership where I bought the car. $240 to replace it with tax and labor.
Check www.autozone.com, they have a Repair Info section that covers Buick LeSabre with this info.
To change the light sensor on a 2000 Buick LeSabre, first locate the sensor, which is typically found on the dashboard or near the windshield. Carefully pry off the cover or trim panel to access the sensor. Disconnect the wiring harness from the old sensor, remove it, and then install the new sensor by reversing the process. Finally, reattach any covers or panels and test the sensor to ensure it functions properly.