Stupid question but here it goes. I'm finishing up the 3l and had a few escape oxygen sensors laying around. Is there any difference in construction between upstream and downstream oxygen sensors. (The escape upstream sensors were able to plug into the contour downstream wiring harnesses)
Due to a little bit of funky running I have reason to believe this was a bad decision, but I want to make sure I am not chasing gremlins in the wrong place.
