any one know if the pre-cat and post-cat O2 sensors actually different or do they just have different connectors?

 

The forward & rear LS1 oxygen sensors are the same, just longer pigtail lengths between the two. Gar

 

I think they are the same, but when I went to use my rear o2`s on the front I tried to solder new connectors on the rear o2`s and the solder would not stick. I think the wires on the o2`s are stainless steel instead of copper. I ended up just buying new front o2`s.

 

I asked the same thing a couple of weeks ago and to my knowledge the sensors are the same, just the connectors are different.