Upstream rear O2 sensor

[ZeroLux]

Anyone have any good suggestions for trying to replace the rear upstream o2? Just put the MX up on jack stands as high as I could and crawled under. Got a good look at where it's located, cant seem to get any tools to reach it well, lots of exhaust piping in the way.

[mitmaks]

You'll need one of these... special socket for unbolting o2 sensors
http://www.harborfreight.com/3-8-eighth ... 97177.html

[ZeroLux]

Yeah, I have one of those. It's not a question of the tool, it's a question of placement/lack of elbow room to work with it. I'll probably just take it to a shop tomorrow instead of fighting with it in my garage. Also think I noticed one of the downpipes being loose under there (on the back side), is there a metal covering over that part of the exhaust or have my welds broken just below the joint after the manifold? Seemed to have too much play in it.

[mitmaks]

You should be able to get it off with wrench/socket. I just did mine last year

[MrMazda92]

Don't take it to a shop unless you've exhausted all other avenues man... It's so costly, for such a simple thing. It sucks, but you'll manage it... Try a crow-foot or adjustable wrench?

[mitmaks]

Remember to use pb blaster to soak it real good, it will be frozen on there from all the heat

[MrMazda92]

If you can do it without melting the wires, try a torch too...

[Daninski]

Ha, mine was so tight torches, wrenches, cussing, big hammer, nothing nope, nothing would budge it. I said screw this and installed headers. I'm sure yours won't be that difficult Good luck.

[crazycanadian]

Ha, mine was so tight torches, wrenches, cussing, big hammer, nothing nope, nothing would budge it. I said screw this and installed headers. I'm sure yours won't be that difficult Good luck.

I feel sorry for you living in the bad rust belt area...

[Daninski]

Take about rust belts, being Canadian in Ontario means back bacon, toques, donuts and oxidation. Every year I bring my Dad's scooter to be 'Rust Checked'. My brothers prosthetic leg seized up over night after the first snow last year and I had to use an acetylene torch and penetrate to loosen it up so he could walk to the crapper. Sucks for rust here that's for sure.