Is this normal??

So I was checking the harness, and after trying to figure out a couple other issues, I was wondering what this is about:
there's a black/red (going to pin 26 which I found out is logic ground) going to the thick grey white, and the o2 is hooked up to that. There's a home-made wire going back to the black/red. So, is this normal-I'm guessing not-, or just more hack from the swap?

there's a black/red (going to pin 26 which I found out is logic ground) going to the thick grey white, and the o2 is hooked up to that. There's a home-made wire going back to the black/red. So, is this normal-I'm guessing not-, or just more hack from the swap?