Anyone had to replace these yet? I crawled under the truck the other day and was thinking about gutting my rear cat's... got to looking around, and couldnt figure out how the H*ll to get to the upstream sensor on the pasenger side to unplug it. Mine is on top of the Motor/Transmission area and even after reaching all the way up there I never could tell how hard it would be to plug back in EVEN IF I could have found it to begin with! No issues yet with the stock one's, but at 85,000k it's not going to be to much longer untill I will have to replace them. Just trying to get some knowledge before hand!

Thanks
Tom