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Originally Posted by wallyx5
I had a the same problem a while back on my 01. I found it was the air ilde control unit. It's a little black box located in the drivers side on the engine. About 2.5 inches by 6 inches long. It has a sensor hooked up to it. It is very easy to replace..about 10 minutes. The part is a bmw only part and if I remember correctly its about 135. If you pull the part out and look at it there is a round flapper valve looking thing with a arm to make it move. Just by looking at it you will know if it is broken or not. Hope that helps. I was getting the same codes you were.
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As while the idle control valve can act like a vacuum leak, the part you just described is the "DISA flap" and controls the variable intake runner legnth system. The idle control motor is the same one used in other BMW models, the lil silver can just above the throttle body.
culthero, also check the smaller branch of the intake boot to the throttle body/idle control, it has a habit of cracking in the turn giving unmetered air to the system. And check the "cyclone valve" crankcase vent valve. It is under the intake. With the engine running rough at idle, use a can of throttle body cleaner with the red tube and spray down areas you suspect for vacuum leaks, the engine will smooth out and idle higher when the leak is sprayed.