How to replace an oxygen sensor on a 1994 buick lesabre

oxygen sensors ( O2S) are located after the cat converter/s
heated oxygen sensors (HO2S) are located in the exhaust manifold/s before the cat converters
so on a 4cyl/in line 6 cyl engine --1 of each
on a v6/v8 --2 of each

Special socket required to remove. Disconnect the wiring harness from the sensor. Use the socket and a remove. You may need to spare with something like wd40or pb blaster other spray to help with removal.

-You mean you want to remove it...?
-If so unplug the wire that connect to and use standard sock to remove it.
-Or if the wire is weld to it and you don't want to damage. You can use combination wrench or oxygen sensor socket to remove it.

Mai

if you used a direct fit O2 it should not be giving you the code again unless the wires are touching near the plug, you got a defective sensor.
if you use a universal it may not read properly.

For 2000 Buick Lesabre 3.8L SFI OHV 6cyl the Oxygen Sensor is located: under hood, center, rear engine area, above exhaust pipe flange, mounted in exhaust manifold.

Fig. HO2S1 location "2" on 3.8L

Fig. HO2S2 location "4" on 3.8L

Hope this helps (remember to rate and comment this answer).

Replace crank sensor

Try a crank sensor yet?

replace the fuel filter,if this does not help,replace the fuel pump.

They are usually on your exhaust pipe before and after the catalitic converter.

My guess is, the mixture is lean. If the oxygen sensor is old, the computer mixes in lots of air. Too much air, a heavy load, a warm engine, and you get missing strokes. At any rate, an oxygen sensor ought to be replaced on general principle after 50K miles. From a parts store, it is about $60. But you can find one online for about $25. It is real easy to replace. You see the oxygen sensor on the exhaust pipe just to the rear of the engine. It looks just like a spark plug with a wire attached. You need a 7/8 inch wrench or metric equivalent or preferably one of those short claws that are like a socket except they grasp from the side and turn with a 3/8 inch socket drive. It will be quite hot unless you let the car sit awhile before attempting to remove it. Since it is in a hot place, use anti-seizing grease when you replace it or you won't get it off next time. Also, bad spark plugs could be causing your problem. But change the oxygen sensor if it hasn't already been done recently.