From the top, I found there was just enough room to get the O2 socket and a skinny, 3/8" breaker bar on the sensor. I put the socket on the sensor first, and then wiggled the breaker bar down in between all the stuff to attach to the socket. I had to kneal on the UIM to reach down and get the tools hooked up so I could actually loosen the sensor. You may need to reposition the socket on the sensor to get the 3/8" drive hole positioned so you can loosen it a few degrees. The good news is once you break it loose, you can usually turn it the rest of the way out by hand. The AC hoses had to pushed slightly out of the way to wiggle the tools in place.
