thx, guys, i'll keep at it, i just hope i don't have to take the whole exhaust off, i can see that leading to more probs.

 

OK< got it! i had to tap out the hole, but at first i bought a spark plug tap, it was for aluminum blocks, not hardened enough to clear out the threads, i got the right tap, it was still difficult but i was finally able to do it and installl the new sensor, let's c now if it makes a difference! thanks for all the help, jc

 

Yeah I can see how that wouldn't have worked real well, glad it had a happy ending