I was able to trace all sensors finally, back to where they belonged. Used a multimeter to find the right O2 connector for the corresponding pin on the DME. Marked them with a marker time lol.
They were all messed up, pre and post.
No more active errors, just 3 shadow errors with TEG_DOWN and TEG_UP Inpa codes.

I heard O2 shadow errors don't mean anything and they won't go away. Saw another post with the same issue.