Originally Posted by motordavid

No code expert, but why not find a good Indie with good scanner/BMW menus and have him read your code(s)?

I had P0172, AZ read it generically, and then a good local Indie nailed it via a specific menu/sub menu and replaced the exhaust camshaft sensor...

Rather than throwing parts, fiddling with MAF/DISA, get it read and then chase the part(s) repair.
GL, mD