Had about the worst experience one could have with my o2 sensor. First, getting the bad one out was disasterous. I didn't have a torch cause my dad was at work, so I muscled it off. Well, I guess my brand new y-pipe and o2 sensor had such a good time together, they didn't want to get separated. After all was said and done, there were no threads left in the bung for the sensor, almost. There were a few threads at the bottom of it, so I ended up cutting the top of the bung off with a sawzall and a ****ty blade to get to the threads at the bottom. I kept telling myself there IS some way this will get completely fubar'd. But to my suprise, it ****ing worked. Then I had to go through the pain in the *** process of trying to plug the damn thing in. So that was my fun for today.