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Any local mechanic shop that has a scan tool can read the codes, doesnt have to be BMW specific. If I were you I would just check all the hoses that have to do with air, step by step. Open the hood, give it a very small amount of throttle, if theres a LOUD whistle, that can be it. Note that, that engine does have a normal regular whistle which isnt loud at all, but if there is a loud one, that can give you a better idea if theres a leak or not. Or what I do is start the car when cold, and carefully move around air hoses and see if the idle fluctuates. Be careful of moving parts though.
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