I am replacing my o2 sensors and all of them are in except the one on the passenger side before the cat. I am having the hardest time getting this one unscrewed. Nothing will fit in there to get a grip on the bolt. Any Suggestions.

 

I just used a combination wrench on mine... not sure what to tell you if that doesn't fit[&:]

 

when I changed midpipes, I think I had to wait until my midpipe was disconncted from the exhaust manifold before I took that one out. I think a small adjustable wrench might work if you are lucky.

 

I was able to get an open end 22mm up there when swapping midpipes. You can also try to rent an O2 socket and see if you can get a socket wrench with the O2 socket up in there.

 

well ive tried the o2 wrench and about three different adjustable wrenches. Its a pain.

 

You're just asking to strip that thing using an adjustable, try an open-ended 22mm wrench.