I used an Oxygen Sensor socket to remove the Oxygen Sensor on the passenger side (before Cat) and there's a ring that the O2 Sensor threads into.. which itself threads into the exhaust manifold.. unscrewed itself from the manifold.

Right now I have an oxygen sensor with a ring on it that I cant get off. I luckily have a socket big enough to fit over it but I'm trying to have a wrench on that while attempting to loosen the O2 sensor from it..

No luck though after lots of PB blaster..

I don't want to try to screw it back in and then unscrew it.. because im afraid of making the o2 sensor tighter within the ring that's around it....

uggghhhh

EDIT:

This pic shows the hole that's in the exhaust manifold (where the o2 sensor)

http://img.photobucket.com/albums/v724/Masisoar/1-2.jpg

This pic shows what's going on.. in the picture, A is the O2 Sensor, B is a nut type ring that goes over it, that has threads of its own that screws into the exhaust manifold.. sort of hard getting it off though.http://img.photobucket.com/albums/v724/Masisoar/2-2.jpg

i believe that is called the dung or some shit like that... call up a muffler martand see if they have any extra.....

It's a removable bung. You'll probably have to clamp the bung in a vise and then remove the sensor from that. It's a large size, so putting it back in could be a chore. Might want to reinstall the new sensor in the bung and then install it that way. Just use the sensor to install the bung and make sure it's tight.

Thanks for your help, I appreciate it.

dung bung whatever i knew it was close.. LOL

Its ridiculous, it wont come off.

it was prob cross threaded and you wont be able to get it off... are you needing to replace that sensor????? if so just go and pick up a bung from a muffler mart i dont think they are that much.....