Replacing O2 Sensor - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-23-2008, 09:48 AM   #1
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Default Replacing O2 Sensor

Is there anyone who can give me step by step instructions for changing my O2 sensor. I am not very mechanical, but I try to do anything I possibly can myself. If it is too complicated I will have to take it to a garage, but I would rather save money if I can.

Thanks!
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Old 01-23-2008, 10:01 AM   #2
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locate the o2 sensor on the rear exhaust manifold.
if you are trying to save the old sensor, rent this kit from your local parts store
if you don't care about the sensor, just cut the wire off and use a deepwell socket to remove it.
it will be easiest to remove if you have the exhaust pipe warmed up, but not so hot you can't touch it.
if it doesn't want to break loose, spray some penetrating oil on it.
installing the new sensor is just backwards.
apply some anti-seize on the threads before installing it (should be included) and tighten with the special socket or open-end wrench.
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Old 01-23-2008, 10:09 AM   #3
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Please disconnect the connector before removing the sensor or cutting wires.
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Old 01-23-2008, 10:09 AM   #4
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Antiseze should be on the threads already. Use ONLY an AC Delco sensor, and you can use a crescent (adjustable) wrench if you want.
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Old 01-23-2008, 11:25 AM   #5
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I thought the O2 sensor was under the hood...at least that'* what the guy at the parts store told me. Thank you all for your help!
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Old 01-23-2008, 11:44 AM   #6
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Here is a pic of the O2 on my 93. Your'* will be in the same location. This pic is of the rear exhaust manifold and down pipe by the firewall.

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Old 01-23-2008, 01:23 PM   #7
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thank you, the picture helps alot. I am hoping that I can find someone to help me do it. I would hate to pay a mechanic again. I think i've put about $2100.00 in this car in the past 6 months!
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Old 01-23-2008, 02:05 PM   #8
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Where are you located? If there is a member nearby that can help I am sure he/she would be happy to help a fellow member.
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Old 01-23-2008, 02:21 PM   #9
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I live in Bath, NY and I work in Naples, NY
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Old 01-24-2008, 11:36 AM   #10
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Does a bad O2 sensor have anything to do with why I used to get 28-29 MPG and now I am getting 22!!!!!!!!!!!!!!!!!!!!!!!!!!?
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