Where the hell is this thing? I followed the wire down from the top connector and it connects up into another connector, but where does that wire go to lead to the O2 sensor? (bank 1 sensor 1)?
Please, give me some guidance, this is driving me nuts. I have a 1999 Max. Thanks.

 

it's on your Y pipe. Get under your car and follow the Y pipe forward and up from your cat.

this is the view when lying under the car, with your head towards the front of the car

 

Lift your car up, its on the 2nd part of the "y" on the y pipe (closest to the flex section)