Hello,
I was helping a friend replace his O2 sensor in a 99 RX 300. I had a very difficult time all the way through getting the sensor out with the little room to move a wrench but I did finally get it out. When I tried putting in the new one, it would catch on the threads, but when i put some force on it, it would just pop off again. I am guessing that the threads are stripped. He did purchase the car used with 25k miles in 2002. Is it likely that the factory stripped this? I couldn't imagine that this was replaced at 25k miles. Any input would be appreciated.
Thanks, Nick