I just got my car back from the shop, I had them do headers/cat/catback and they told me my rear o2 was bad so they replaced it. then I was under the car yesterday checking it out and..how many o2's am I supposed to have? cause I counted 4 1 after the cat, 1 before the cat and 1 on each side of the y pipe before the headers. 4 is not normal correct?

 

you should have 2 upstreams and 1 after each cat, so if you have 1 cat you should have 3 o2s if you have 2 cats you should have 4 o2s.

 

Replacing rear O2s with new ones is just stupid. They are noting but tattle tails for the cats. If one of them goes you replace a precat sensor and take the working precat sensor and put it behind the cat. That way you get the benifits of a new sensor in a position that actually affect how the engine runs..

 

^^^

Or, if your not worried about violating federal emissions laws, ditch the cat(s) and O2's behind the cats!

 

The pre cat O2's have diff plugs than the rear O2's Genius.

 

Doh..... forgot that... I still say ditch'em if you dont need'em...

 

Not on my car. All 4 are the same. Find it a bit surprising that the f-body would be different, but will have to take your word on it.

 

well its a two cat camaro...but only running 1 cat.
screw it I'l gut it and ditch emmisions which is what I wanted to do anyways but that shop was to afraid to..