rear o2 sensor totally fused to exhaust

[alIan]

Ok guys i'm trying to remove my stock exhaust to throw on my new turboback... but i CANNOT get the rear o2 sensor off of the system. It is totally fused... i've coated it with liquid wrench 10 times, and i am getting the best leverage i can while under the car, still it hasnt budged a mm. is there any wa y i can disatach it from the car without unscrewing it from the exhaust, so that i can get it to a clamp and get better leverage? Or any other recommendations on getting it out? thanks

 

[AWDkitkat]

blow torch

 

[L2RTSiAWD]

Yes you wil be forced to cut it out or use a blow torch on it.

 

[alIan]

i dont have access to a blow torch of any kind, and even if i did i dont have the skills to use it (though i could fudge it, hah)... is there not a way to remove the oxygen sensor entirely, wire and all from the car? Certainly there has to be, or what would the dealer do if you came in w/ a faulty sensor/wire? I cant find it anywhere in the service manuals... maybe i just suck at searching them...

 

[nine5raptor]

it is plugged in under the drivers seat.

 

[nine5raptor]

pull the seat out, lift the carpet, and disconnect.

 

[2-0turbo]

Hammer or bigger wrench--that is what I usually go for. If not that, the smoke wrench.

 

[ChicagoGSX]

Breaker bars are your friend. I just stuck a line wrench on (7/8" I think?) and got out the breaker bar and it came off.

 

[alIan]

thanks anyway guys, but i just threw the stock exhaust back on, as i leave for school in 2 days. i'll just attach the exhaust when i'm back in 4 months, on summer vacation from berkeley. Or just drive down to SD and have ryan do it for me

 

[RnR Racing]

That sucks that you won't be able to enjoy your exhaust for anotehr 4 months. We like the to use K&N fliter oil. It really penetrates good and helps to break things loose. Also a big breaker bar.

 

[nine5raptor]

really? hmm. haven't tried that one yet. i like the pb blaster and there was a discussion going on for a while about 'mouse milk' wasn't the you, l2rtsiawd, that recommended that one? I'm just not up for milking a mouse...j/k =)

 

[nine5raptor]

the worst bolts I've had to take out were 02 sensors and flywheel bolts. for 02 sensors, i use a 24" crescent wrench, pb blaster, torch and 26 oz hammer.
to get my flywheel bolts off took 2 250 lb guys hanging on the end of a 2' breaker bar and another tapping with a hammer (1000+ ft. lb of torque)

 

[larryd]

its funny that you mention this, I just had the same problem with my rear o2 sensor.. I tried 3 different size adjustable wrenches on that sucker and all the WD40 in the world wasnt gonna help me.. I was smacking it with a hammer but just couldnt get a grip on the sensor enuf to ge it to budge. I eventually ended up with a large pair of vice grips on it and clamped that sucker down and broke it loose with the hammer.

 

[GSX4LIFE]

Try letting the car run for awhile to get the exhaust hot. Then try breakign it loosewhile its still hot. I had the same problem with my front O2. It would not budge with any amount of torque I put on it. Afetr I heated it up by running the car, it came right out.