Help...I can't get my oxygen sensor off. - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 02-26-2009, 07:49 PM
jrk247 jrk247 is offline
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Question Help...I can't get my oxygen sensor off.

I'm trying to replace the front o2 sensor on the Envoy. The socket just slips and will not loosen it...any ideas how to get it off?
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  #2  
Old 02-26-2009, 08:02 PM
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Quote:
Originally Posted by jrk247 View Post
I'm trying to replace the front o2 sensor on the Envoy. The socket just slips and will not loosen it...any ideas how to get it off?
Do you have the wrong sized socket or has the 'nut' now been rounded over? If the nuts is rounded, try a pipe wrench, large vice-grips or borrow a bolt extractor.
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  #3  
Old 02-26-2009, 08:09 PM
jrk247 jrk247 is offline
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Originally Posted by ylab View Post
Do you have the wrong sized socket or has the 'nut' now been rounded over? If the nuts is rounded, try a pipe wrench, large vice-grips or borrow a bolt extractor.
I bought the socket from Autozone that's for them...so i think it's the right size. It's not rounded, the socket flexes and just moves. I can't get to the nut with vice grips...can I attach it to the part of the sensor that sticks out or will that break it off?
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  #4  
Old 02-26-2009, 09:46 PM
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MAY03LT MAY03LT is offline
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Originally Posted by jrk247 View Post
can I attach it to the part of the sensor that sticks out or will that break it off?
it will break off

if the sensor is in tight enough to flex the tool (assuming the tool is heavy duty) I would soak the sensor in pb blaster overnight, if that doesnt work I would heat it up
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  #5  
Old 02-26-2009, 10:10 PM
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are you sure youre trying to remove the right part?
Just in case
Should be located on the passenger side on the exhaust manifold.
You should be able to view it from the rt wheel well. you can turn the wheel to access it.
Im a little concerned that its bending the tool youre using.
they are usually hardened since they have the opening on them to allow the wire to not be damanged.....
Can you take a pic of the O2 sensor?
Can it be rusted on there so much.
I replaced mine at something like 130,000 and it came out very very easily.
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Old 02-26-2009, 10:11 PM
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Originally Posted by MAY03LT View Post
it will break off

if the sensor is in tight enough to flex the tool (assuming the tool is heavy duty) I would soak the sensor in pb blaster overnight, if that doesnt work I would heat it up
I didn't have enough time for PB blaster to do its magic, so i just had the engine running for a couple minutes and it got hot enough for me to pry off. I parked in a garage with my feet pushing against the wall though..it'll take a lot of effort.
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  #7  
Old 02-26-2009, 10:20 PM
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Quote:
Originally Posted by MAY03LT View Post
it will break off

if the sensor is in tight enough to flex the tool (assuming the tool is heavy duty) I would soak the sensor in pb blaster overnight, if that doesnt work I would heat it up
PB Blaster. Do it a couple times (assuming you're not in a hurry). Let it soak for a long time, overnight would be great. If that doesn't work, then try the heat, but remember to heat the manifold around it and not the sensor itself. You want the metal around it to expand.
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  #8  
Old 02-26-2009, 10:56 PM
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I don't know if it's a west coast thing - but mine came right out too. Very little effort, no soaking it or anything. I did mine when the engine was overnight cold.
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  #9  
Old 02-26-2009, 10:58 PM
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Quote:
Originally Posted by Super 88 View Post
I don't know if it's a west coast thing - but mine came right out too. Very little effort, no soaking it or anything. I did mine when the engine was overnight cold.
That's exactly it. Us midwest guys are in the salt belt. We know how to make plastic rust
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  #10  
Old 02-26-2009, 11:49 PM
Double D Double D is offline
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If you need help let me know. I will bring over my socket and give it a try, I will also bring a pipe wrench just in case. I changed mine last week and I expected a struggle, but it came out very easy.
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