[Mircea]

Originally Posted by Phil325i

I doubt NOx sensor would cause a misfire. I still think you're right - it's injector(s). See this thread:

https://www.e90post.com/forums/showt...5#post23587995

If you can afford it, I'd replace all six injectors, not just one bank.

Update: I have continued querying about the procedure with MapTech and they told me if I have NOx cat issues, just coding out the NOx sensor wouldn't fix those. I'd additionally have to have the secondary cat removed.
They told me it would obviously cost extra, but that I could have it done at any other garage if I wanted to.

However, what's just curious is that in the thread there, Will_460cs says it fixed the NOx ageing issues for him and hasn't mentioned anything about removing the cats themselves. He hasn't been online since last year though, so I think waiting for a reply to the PM I sent him is hopeless...