OK - I have a 3.0 motor and that's been my experience.

Does it start with the MAF plugged in?

If it doesn't and it's starting with the MAF unplugged, that may actually be generating your errors.

Troubleshooting with all variables is not a good way to start. I'd say pickup an original BMW MAF from the dealer and plug that in. If it starts right up, then you know you've got bad MAFs - which isn't entirely impossible. If it doesn't work, you can always take it back.

If you do suspect you have a vacuum leak, check the usual areas but if you don't turn anything up, take it to someone who can perform a smoke test on it. That will save you alot of grief.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean