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Hi: Ive changed the oxygen sensor in the back , located in the exhaust manifold. You'll have to purchase an oxygen sensor socket so you can get the socket down over the wire coming out of the oxygen sensor.This socket has a slit in one side so the sensor wire can fit through. Turn it counter clockwise and its out. Be sure to use some antiseize compound suitable for oxygen sensors when installing the new sensor. All of the above items can be bought at your parts store.

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18y ago
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Q: How do you change O2 sensors in a 2000 Alero?
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