You guys are right. The sensor on the back of the CAT is other O2 sensor. It makes sure that the CAT is working properly. I guess it's more of an emissions sensor than a management sensor like the front one.
I'm glad I said (I think) that it was a A/F sensor
That saved me right? With all they reading and research I'm doing on O2's...I'm getting all confused. I'm no mechanic that's for sure
Mike
[This message has been edited by FargoRS (edited January 19, 2001).]