What year is your truck?

 

2001 v10 8.0 2500

 

I can find diagrams in the service manual for everything BUT the V-10..... WTF?

Usually, if a sensor is screwed into the cat, it's a front O2. Left side will be bank 1, right side will be bank 2. (unless you only have 'em one side, then that side will be bank 1.....)

Are you getting codes?

 

 

That should have been 'can't', and I was referring to the layout of the exhaust. They don't have anything for the V-10, aside from the muffler......

 

https://drive.google.com/file/d/1UMA...ew?usp=sharing

feel free to download the parts manual.
here is the exhaust sensor layout with p/ns

 

My fault 😂 I always help with the wrong thing

 

But we always blame it on your phone.

 

Those are screenshots from my phone

 

Awsome so it is a Pre cat sensor. Thank you! That helps with finding the correct senors a lot! A little lost on the correct sensor for Left Upstream now, but I think I can figure it out.