What is the difference between the pre-cat o2 sensor an the post? The only thing I can see is the length of the wires.

 

pre..is before the cat...
post is after

 

/\ /\ /\ /\
You learn that in school?

Now does any body know if there is a difference between the two besides the length in wire?

 

Yes, the pre-cat O2 is heated, the post-cat isn't heated.

 

They're both heated (see pins C and D in HO2S connectors in attached wire diagram)...

On F-body, 3 of the sensors are the same; the 4th one has a different length sub-harness but is otherwise the same.

On Y-body, the connectors might be different (I'm not sure).

 

oh, i learned something today. Didn't know the post cats were heated.

 

I knew I could count on you guys. Thanks a bunch!