Codes...no code xpert here, but I'm with QwikAg on getting them 'read' and defined via a quality investigation vs throwing parts at a basic code:
Imo, codes are basic alerts but not specific root cause(s) indicators, unless I am more dumb about codes than I thought.

I had code P 0172 last year, and after searching here and on the net, the list of possible causes and fixes was more than a half dozen possibilities, none of which really offered a root cause chart or tree list of fixes to do, in order..

I did do the first one on many lists and 'cleaned' my MAF though it looked like new, and also checked intake boot/connections etc. All fine in that situ, but still had the code, after another trip to have it read/cleared.

Then I took my X to a local indie, (he doesn't specialize in BMW et al but he has a couple of his own, and is a good local wrench and good friend). He read my code with a Launch X431 and a pricey BMW code menu program he has: he pulled 'sub code 12', exhaust camshaft sensor.

~$100 part, 5 min install, a hug and a tip, and it was fixed...

My anecdote is that the code being 'read' at AutoZone, et al, is not getting the info one may need to narrow down the problem and avoid parting a fix. And as I don't own some of the code readers that get mentioned on this site, I am not aware of those devices to dig into the situ and display a 'fix this' solution(s). But, basic codes are pretty vague, in my limited experience. I miss old carbs, and easy car/m'cycle repair. :D

If I am way off the mark here, this post is not meant as a debate or 'correction', and I am glad to be educated on codes and the root cause investigation process.

But, I am glad the Professor found a simple solution and a fix... :thumbup:
GL, mD

I did research the codes, and once the shop is ready to do the bodywork, my cousin the mechanic who also is a BMW owner will read the codes with his equipment (if the codes come back). All is well so far, though DISA, CCV, and other things will be replaced later this year, sooner if any of my prospective clients close and pay up in the near future, lol.