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So, you do need to run a code scan to attempt to narrow down the issue. The Ms do not have a maf sensor....
Anyway, based on experience this could be a lot of things. Without the codes you will be guessing. Ista, bmw Carly, etc. can get the bmw specific codes.
Does it go into reduced power mode? Does reduced power mode go away when you turn the car off and on? Is it a check engine only light
It can be a ton of things from your description. Ranging from vacuum leaks in the pcv and vacuum lines, boost leaks, Bad filtered air ducts, bad map sensors, bad tank pressure regulator, bad pressure converters, bad diverter valves, bad turbos, bad injectors still (yup maybe botched), Bad tune, bad 02 sensors, and on and on.
Let’s just say this is a common issue on Ms and it can have a lot of potential causes. Some are cheapish. Some are thousands. Vacuum and boost leaks are very common and I’d have someone do a smoke test, next most common is bad sensors.
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