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Rusted tight O2 sensor

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Old 05-03-2012, 01:02 PM   #1
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Default Rusted tight O2 sensor

Im having a problem getting my downstream O2 sensor to break loose. I have used buster to break away the corrosion and used many tools to grab and try and bust it loose but no way it wants to budge. I also don't have much leverage being as I only can lift the car so much using a jack. Any suggestions. Also I stripped the nut.
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Old 05-03-2012, 01:10 PM   #2
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Originally Posted by Bkclark View Post
Im having a problem getting my downstream O2 sensor to break loose. I have used buster to break away the corrosion and used many tools to grab and try and bust it loose but no way it wants to budge. I also don't have much leverage being as I only can lift the car so much using a jack. Any suggestions. Also I stripped the nut.

I assume you mean a can of PB Blaster. This is a rinse and repeat process. Soak it let it sit for a couple hours. Try it again, and if it doesn't work give it some taps with a hammer to try and break up the corrosion and then blast it again and let it sit.

I had an O2 sensor that was stuck like this. After a few days of repeating the process I was ready to torch it. Gave it a third (or was it fourth or fifth?) dose of the PB Blaster and finally broke it loose.
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Old 05-03-2012, 01:20 PM   #3
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For future issues, it helps alot to have a o2 sensor socket. Alot less slip than a wrench. I need to pick up one myself
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Old 05-03-2012, 02:20 PM   #4
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PB Blaster and two wrenches. Use the open end on the sensor and fanagle the second wrench into the closed end of the first to create more leverage. Like this

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Old 05-03-2012, 04:42 PM   #5
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This may be a lot of work, but probably safer and more effective than working under the car. Unplug the sensor, remove the cat and work on a bench.
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Old 05-03-2012, 06:53 PM   #6
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This may be a lot of work, but probably safer and more effective than working under the car. Unplug the sensor, remove the cat and work on a bench.
So you trade 1 rusted bolt (o2 sensor) for 5 rusted bolts on the cat?
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Old 05-04-2012, 07:37 AM   #7
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Originally Posted by s2klariat View Post
Quote:
Originally Posted by mister x' timestamp='1336088542' post='21667645
This may be a lot of work, but probably safer and more effective than working under the car. Unplug the sensor, remove the cat and work on a bench.
So you trade 1 rusted bolt (o2 sensor) for 5 rusted bolts on the cat?
I second that.......And those bolts that are on the CAT are a major pita to get off too! Air tools are your friend there.

Though this might be your only option at this point if the O2 sensor is now stripped.
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Old 05-04-2012, 08:40 AM   #8
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I bet it will come lose if you get that car more than 1'' off the ground, use a fat ass wrench and do what was mentioned above, PB-wait-PBwait then attack that f@#ker like never before, but get a real jack so you can get some beast mode behind it, and also dont slowly apply pressure, apply force all at once, it will come
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Old 05-04-2012, 06:39 PM   #9
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If it's stripped completely get a cheap 12" pipe wrench. Use a short length of pipe on it. Are you using jack stands? If you are not, buy those first.
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Old 05-05-2012, 04:45 PM   #10
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If you tried it when it was completely cold, try it when it's hot. The difference in metal expansion might make it easier to remove.

Another option....ever seen those As Seen On TV sockets where it's got a number of sort of loose rotating little rods inside the socket? A friend was able to use that to get a rounded off bolt when nothing else would work.

Third option, just say "F it" and leave it on the cat. It doesn't affect drivability, and is really only important when it comes to smoging the car!
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