Put your *** into boy, grow some ***** you drive a dodge now!

 

My has been on for 173K miles. I was going to change them today but ran out of light. Usually when i have something stuborn, I use PB Blaster. Hit it with some PB Blaster and let it sit over night then hit it again and heat it up. That usually does it but I'll let you know tomorrow if that works .
I don't know that I would worry too much about rounding it off. Take a 24" or 36" pipe wrench to it

 

well if dodge wouldve put that dang sensor in a sencible place this wouldnt be a problem!!! lol

 

If you use a good penetrating fluid on it such as CRC Knock'er Loose/Cyclo Breakaway/AeroKroil then it will break free if you try to get it off about 5-10 minutes after you spray it.
If you use wd-40 or pb blaster then it's going to take a lot of time and effort. These are lubricants, not penetrating fluids.
I got mine off about an hour after I got back from town and it took me something like 3 minutes. I hopped down there, sprayed the threads, tapped the o2 bung on the pipe a little bit to work the penetrating fluid into the threads, then I put the crescent wrench on it and twisted it right off.

 

Agreed. I can't understand why people believe WD-40 is a great pentrant.

 

Maybe it is because the can says it is.

 

Yeah, and most DIY people are idiots because they match the definition of insanity -- repeating the same actions hoping that there will be a different result. I'm on a VW forum where people will post the same issue -- "HALP! I sprayed WD-40 on this stuck thing for two weeks and it won't budge!" They'll go through gallons of that shiat rather than pony up for something that works.

 

or use something that they have laying around - 50/50 mix of acetone and atf.

 

I've used it all, and now I use old transmission fluid. I just haven't found anything better, and it's very inexpensive.I'll have to try the acetone mix.

 

I was reading a thread on an antique tractor restoration forum and they tested a few different penetrating fluids by scientifically rusting a number of bolts and testing the torque needed to remove each one. wd took the most torque, then pb blaster, then liquid wrench took half as much as pb, then aerokroil took a few pounds less than liquid wrench and the atf/acetone mix took half as much as the aerokroil.