So I ordered a new rear O2 sensor for my 98 auto and today I have the day off so I figured I would change it but I can not get it off! I tried this sensor wrench my father gave me but it seems a hair too big and slides around on there and I dont want to strip it and I cant get an open ended wrench in there. Any help is appreciated. Thank you

 

Try a large adjustable wrench and some Screwloose from CRC or WD-40. This worked with mine. It may also depends on which O2 it is.

 

I bought an 02 sensor socket as well and NEVER use it. What I use on my aftermarket y pipe (might not work on stock because of all the heat sheild flanging) is a 7/8's open ended wrench and a hammer to loosen it initially. After that they always seem to unscrew fairly easily for me.

 

I had a heck of a time on my '97. After rounding the hex, I heated the bung with a torch and used a vise-grip pliers. Use anti-seize on the new one.

 

heat the bung and then squirt penetrent on let it cool about 15 mins come back and it will come right out. at least it works for me.

02BO

 

just used the fluid that they always recommend.worked......

 

When I was putting my catback on we had the same issue, what we did was we took the wrench and smacked it with a hammer, and a few good smacks it gave out