I've got the part and tools. But how I'm not seeing how to remove this sensor. My wrench fits in between the axle and the pipe, there's not enough room to unscrew this thing. How did you guys get yours off?

 

To give you an idea, here'a a similar video replacing the upstream O2 sensors.

 

Thanks guys. I got it off eventually, just a matter of experimenting with different angles.

I used PD Blaster, let it sit for a while, while I was experimenting with different angles. The best angle gave me about 4" of movement to push against. I used the O2 tool with handle, then added leverage with an extension and socket.

Saved a bunch of money. I'll be replacing the others soon.