Ok, so I can't get this ****er to break loose. I really don't want to buy a new one ($430). Is it done for? Give me advice on what you would do this in situation please.

I've soaked it in PB-Blaster and let it sit for like 2 hours in a tub of PB-B. I've torched it multiple times with a propane torch. After the 22mm open end wrench stripped the edges of the bolt, I resorted to using a vice grip. I think that made it worse.

 

Are you upgrading your housing? I'd just get a replacement O2 for at AutoZone for $58.
Bosch/Oxygen Sensor
For your 2003 Mitsubishi Lancer Evolution AWD 2.0L MFI Turbo DOHC 4cyl
Price: $57.99


Part Number: 15730

 

save your self the problem and get a new one like he said ^

 

Omg, I called up the mitsu dealership and they wanted ~$430 for it. Yea, I just installed a new housing. Gonna check out autozone.

Thanks man

 

wow that is bad... u had it worse than me pulling that out. i had a stripped nut on my head that i needed to remove my intakemani from.. i found some helpfull threads for u to looksee

Howto remove a stripped nut:

http://boards.straightdope.com/sdmb/...d.php?t=525076
http://www.triumphrat.net/twins-talk...ipped-nut.html
http://answers.yahoo.com/question/in...1091924AAJOMxd

what i ended up doing for me to seperate it was a dremel and pb blaster ofcoursewith a grinding bit to reshape the nut and even the visegrip locked on and i finaly removed the nut off

thy all refer to a tool called a "nutcracker"
hope this helps

 

Try tightening the sensor, then loosening and repeat. At this point, don't be afraid to hit that wench with a big hammer at the same time.

 

O2 Sensors can be tough to remove especially that close to the exhaust manifold. IMHO WD-40 and PB are fine lubricants but the best for rusted seized parts is Kroil. If Kroil + an impact wrench won't do the job then it's "welded" in there and it's time for the Dremel tool. Use some anti-sieze on the new one.

 

You're pulling your pud messing with a propane torch on that, you need something hot enough to get the cast area around the O2 sensor cherry red. A cheap trick you can use if you don't have access to an Oxy Acetylene torch is a plain old road flare, use it out doors of course. They burn at about 2,900 °F so be careful.