I am installing my headers with no cats and can't afford a tune at the time so would these keep the ses light off till I can have the rear o2s tuned out?

 

Yeah thats what they are designed to do. I heard they were gonna stop manufacturing them though...

 

I have a set, there are a few problems, GM, in their infinate wisdom, made about a half a dozen variants of o2 sensor (all with different voltage output)

First, what shape are your connectors?

What color are they? (Some are black, light grey, dark grey, even tan/light brown)

Color and shape will tell you what o2 sims you need. I have the square, light grey sims. I took a shot, mainly becuase thats all that Thunder racing had left, and it didn't work. The code it gave me was "no activity from rear o2s" Two codes, same for bank 1 and 2. Basically, they didn't work for me, but they are no longer produced, so I can't return them, if you want to try em, make me an offer. Cost me $100 for the pair.

 

BTW, these were in my 02 Z71