I'm sorry but you lost us by jumping steps. Get the codes first.
A bad active tank or scr wouldn't make you run rough. A blown fuse either. It would just not start.
But what did bmw tell you after you gave them diagnostic money.
I don't hear besides then telling you a fuse? Breathe and think straight, get the codes they saw on paper.
Without codes we can't help you and you are just making it harder for diagnosis.. One step at a time

I know these new electronics are hard to troubleshoot at times, it's overwhelming to me too sometimes but you can't get far by shooting in the dark.