How to Replace O2 Oxygen Sensor 1997-2003 Buick LeSabre

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Hi, I'm Don from 1A Auto. I hope this how-to video helps you out, and the next time you need a part for your vehicle, think of 1AAuto.com. Thanks.

In this video, we're going to replace the upstream oxygen sensor which is the oxygen sensor that's in front of the catalytic converter. This is a '97 Buick LeSabre. It has the 3.8-liter or a 3800 engine. Engine used in many, many, many GM vehicles. The most important tool you'll need is a 7/8 O2 sensor socket which you'll see in the video. Then you'll need a couple of extensions and probably a breaker bar and maybe a piece of pipe for some extra leverage to get it out.

Here's your harness for your upstream O2 sensor. Pull out the clip and lift this up over. Move the harness and then remove the clip from the bracket. You see the oxygen sensor down here. I'm just going to sneak this harness out of the way. This is a piece of socket wrench. Use a special O2 sensor, 7/8 inch socket, that's got to cut out for the harness. Slide that over. Use the pipe for extra leverage.

Once it's loosened up, it comes out about on a quarter and a half a turn, so spray it down with some penetrating oil. Screw it back in, then do it back and forth a couple of times to loosen it up as much as we can. Spray it with some more penetrating oil. Screw it down back in and loosen it up. After about two or three iterations of that, it finally comes out.

The old part, the new part from 1AAuto. As you can see, the connectors are the same.

You can start this by hand before I put the socket on. Now we're using the socket it to tighten it back up.

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