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Old 07-26-2012, 05:57 PM   #1
Kcanz13
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silver w/ cf hood

Default o2 sensor out of stock wrx exhaust

So I need to get out my old o2 sensor but I have tried everything to get this SOB out and nothing has worked. The only thing i haven't tried is heat. Any good suggestions?
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Old 07-26-2012, 06:02 PM   #2
Kcanz13
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It is in the stock down pipe btw
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Old 07-26-2012, 06:59 PM   #3
cal_look_zero
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Heat. Soak it in PB blaster over a couple of nights (Like SOAK the o2, several times. Then use a torch to heat the metal around the bung. Sometimes trying to tighten it will break the hold, then you can get it out easier.
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Old 07-26-2012, 11:07 PM   #4
RaceFaceXC
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keep in mind, you will destroy it by using heat and/or pen oil, in case you were planning on using it again.
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Old 07-27-2012, 10:49 AM   #5
Kcanz13
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Quote:
Originally Posted by RaceFaceXC View Post
keep in mind, you will destroy it by using heat and/or pen oil, in case you were planning on using it again.
So i won't be able to use it again? Im trying to use it again and save some cash but if its a lost cause then so be it. Is there anyway that I can use it again?
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Old 07-27-2012, 11:43 AM   #6
Sir-Knight
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wrx o2 sensors don't work on 2.5is as far as I know.. different wire configuration.
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Old 07-27-2012, 04:40 PM   #7
Kcanz13
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I have a 2005 wrx. 2.0T.
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Old 07-27-2012, 06:00 PM   #8
RaceFaceXC
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Usually heating the sensor without the sensor being in the hot exhaust stream will harm or destroy it. Don't know why exactly but they are sensitive. Any foreign substance like a penetrating oil or even water is harmful to the objective end of the sensor. If you keep that part dry you might be ok. When Removing a stubborn or old o2 sensor its a good idea to at least have a spare since chances are good that it will be junk.

Side note: this is the n/a powertrain forum. For future inquiries about the vehicle in question I would post in the correct forum as you will get better feedback.
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Old 07-27-2012, 10:24 PM   #9
J.Gibbs
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Are you using an actual oxygen sensor wrench? With a breaker bar on it you should be able to break them free easily. I just got mine out after 180k miles of new england weather with not too much force
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Old 07-30-2012, 03:09 PM   #10
Kcanz13
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Quote:
Originally Posted by J.Gibbs View Post
Are you using an actual oxygen sensor wrench? With a breaker bar on it you should be able to break them free easily. I just got mine out after 180k miles of new england weather with not too much force
I have tried that, minus the breaker bar. Ill have to try it out
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Old 07-31-2012, 01:08 PM   #11
Samirr76
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Quote:
Originally Posted by Kcanz13 View Post
I have tried that, minus the breaker bar. Ill have to try it out
try out the correct forum, this space is for Non-Turbo vehicles.
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Old 07-31-2012, 02:29 PM   #12
J.Gibbs
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Quote:
Originally Posted by Samirr76

try out the correct forum, this space is for Non-Turbo vehicles.
Raceface already brought that up. It may be the wrong forum but its an easy question to answer, that's why I did. If its that big of a problem mods will move it

OP, get an offset style 7/8" (22mm) oxygen sensor socket. It takes a 3/8 drive breaker bar. Can be had for like 6 dollars at harbor freight. Sears carries them too for like double the money. The offset gives you more torque to bust those old sensors free and can get into tight spots
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Old 07-31-2012, 03:15 PM   #13
J.Gibbs
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This is what I use:




Notice the wrenches aren't even breaker bars. My foz is a 98 with 180k and both O2s came out without too much muscle, plus the sensors were stock!
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Old 07-31-2012, 04:11 PM   #14
awd1927
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yea like mentioned above ...soak in pb blaster and a good breaker bar ...you just need the right leverage
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