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94 Seville; 95 FWB; 07 DTS
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657 Posts
Discussion Starter #1
Has anyone here ever had the pleasure of removing/replacing an oxygen sensor? I am stuck on the removing part. I have the offset wrench that is driven by a 3/8 ratchet but try as I might I cannot get enough leverage to work that sucker. I have tried everything at my disposal, 8" breaker bar, regular 3/8 ratchet, even a stubby 3/8 but can't get it to budge. I do not have access to impact tools, (would that even be wise in this situation?)

I sprayed PB on the sensor three days in a row before I tackled it. Only got as far as disconnecting the plug...haha

Any suggestions?
 

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Registered
94 Seville; 95 FWB; 07 DTS
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657 Posts
Discussion Starter #3
don't have access to a torch.

the biggest issue though is clearance to work the wrench
 

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98 DeVille, 97 DeVille d'Elegance
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7,345 Posts
Try the freeze spray they sell if no torch. Worth a shot. A MAP gas hand held torch might heat it up enough also.
 

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94 Seville; 95 FWB; 07 DTS
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657 Posts
Discussion Starter #6
the cats, don't they have to be cut out? not true?

and did you do both at the same time or as needed?
 

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Super Moderator
2014 ELR
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9,728 Posts
Three nuts to take the cat off the manifold, two more nuts to remove the cat from the mid pipe, one side has a bolt to hold the EGR in place. However... if you live where there is rust... the nuts on the manifold will be tough without a torch. You certainly do not cut them out. Do both sides.

This might be one of those jobs for a shop. It's really easy with a torch.
 

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1989 Cadllac Brougham
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202 Posts
I tried to replace mine myself a few years ago, it was stuck rock hard, no rust disolver would help. Handed it over to a mechanic, he eventually managed to pull it off, but it was stuck so hard the entire fastening came off. Had to weld on a new fastening device and all
 

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1980 FBC
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980 Posts
Magic thread loosener fluid only works when it actually gets to the threads. It won't when there's a steel gasket like O2 sensors have.

A plumbers torch will work fine. Heat the heck out of the bung the sensor screws into.
 
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