when i got my exhuats cut-out the guy had to move my O2 sensor to place the cut-out. he could not get out the O2 Sensor out of thefittingso he grabed the torch and cut it around it and then welded it back in another spot. since then i started getting bad gas mileage. does anyone think that it might have messed up the sensor.

 

yeah i think it sounds like it might have messed your o2 up by doing that, it is wierd to say you cant ever understand those things lol, look at me im trying to tape into my signal wire on my o2 and i cant find no one that has my diagram of my trucks wireing display so i cant find the right colors to match it to lol