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Old 01-16-2008, 04:50 PM   #1
E30 enthusiast
Join Date: Jan 2008
Location: Toronto
Posts: 50
O2 sensor

So I had a mighty fine struggle with my first attempt at replacing my O2 sensor last night. Fack. I almost pulled a muscle...pushed, pulled, yanked on the damn wrench, but the sensor was fused to the pipe. I'm going to put it up on ramps and see if I can take a hammer to the wrench from underneath. Second attempt in the werks.
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Old 01-16-2008, 05:19 PM   #2
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get out a torch and heat the sucker up. thats the only thing that'll make it move sometimes.
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Old 01-16-2008, 08:42 PM   #3
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^^ thats right. you could treat it with penetrating oil to ease things. but it won't budge with out heating it dont want to damage the threads either.
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Old 01-17-2008, 12:53 PM   #4
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Got it will break out the mini torch. Thanks!
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Old 01-21-2008, 11:03 PM   #5
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When I replaced mine I had to destroy the old one to get at the base of the sensor to remove. I heated it up and used a good size wrench with a pipe extention for far as the thread goes there is a tap available that normally is used for sparkplug holes that is the same as the sensor thread. I think princess auto has them if I remember correctly from my catalogue. This worked for me. Also if you do have to retap the thread be patient and make sure you retap it straight.
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Old 01-23-2008, 08:33 PM   #6
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does anyone use an 02 socket and a breaker bar or rachet? mine has always come out easy on 3 of my exhaust setups
89 327iT
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Old 01-24-2008, 12:09 PM   #7
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I used the mini torch, and the closed end of a wrench, slipped the chord through and came off in a snap. I looked at picking up the tool you suggested (like 20 bucks) but gave it a go first...the heat did the trick.


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