The o2 sensor is in the rear exhaust manifold.You should be able to see it from under the hood.It takes a 7/8 special socket.You can find you at any parts store.You might want to soak it with penetrant.P.B.blaster works real good.Try not to cross thread it.There is only one o2 sensor on your vehicle.Hope this helps.Good luck.
I just use a 7/8 wrench go to back side of engine unplugg the o2 and remove from the top there may also be one after the cat not sure about that year also clean the threads of the hole before you install new part and use the thread lube it should come with the new sensor if you cant get the wrench over the plug end of the sensor just cut the wires on the sensor side then remove.
SOURCE: how many o2 sensors does a Buick LeSabre have?
Assuming it is the 3.8 liter V6 there should be 2. I just replaced mine this weekend. One is on the exhaust manifold visible through the engine compartment. Hard to reach. You have to pretty much get into the engine compartment to reach it. The second is just behind the catalytic converter. Relatively easy to replace except getting to the plug. My metal shield that covers the plug was riveted and I had to drill out the rivets and replace with sheet metal screws. No other way to get to the plug.
Hope that helps.
I put liquid wrench on mine before trying to loosen them and they loosened quite easily. I think it was a 22 mm wrench for both. Tightening the front sensor required slip joint pliers at times to allow the wrench to slide onto the "bolt"
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do u have the special O2 sensor socket?
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