What he said. You can unplug MAF and the car will run.

My very first repair was cam shaft position sensor which caused the car to stall regularly at increasing frequency.

It's would be my first bet in your case. The engine will not run without CPS. If the CPS is just not reliable you'll get shut down and stall. I've never gotten a code for one of my two cars directly related to CPS when they have failed just odd codes that indicated chaotic readings from CPS were likely.

I have the "cheat" of two M54 engine cars and swap parts to diagnose problems. If your CPS is shot I would expect the engine computer to not even send gas to the cylinders. If you get random firing you maybe get a wayward signal occasionally.

My new reader can monitor the CPS real time and with 8 cylinder cars it's very easy to detect CPS problem by the differences but with a single bank car it can be very difficult. There was definite guesswork involved with my car and it was absolutely the CPS.

Both mine and wife's CPS failed about 130,000 miles for comparison.

Engine computer will shut off fuel flow if it can't tell where the cam is. When my CPS started to go, the signal wasn't strong and sometimes especially on throttle off going slow (say going 8 mph then coast) the car would stall. I would pull an error that would tell me cylinder 3 gas was shut off for example, nothing to do with CPS. The error code combo (there were two) led me to xoutpost and CPS being the likely cause.

Bought an OEM CPS via Amazon (none available prime) and in 4-5 days had a BMW stamped part with German directions car fired right up with new CPS no related problems in the next 30,000 miles.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)