[hjfirefighter]

Yeah, the more reading I do, I know exactly where it is now. In the exhaust pipe, just before the catalytic converter. It is more or less a new name for the older O2 sensors. Thanks for the advice on everything including the $3 nuts. It's a rip-off, but more convenient just to give them $6 and know they will fit. I was assuming that the gasket would come with it, but maybe not through the dealer. I'll check it out....Thanks again.