Got 5000 miles on mine, and no CEL so far. Being a BMW Diesel, I can only imagine the sophistication of the whole thing. Remember, this thing is not a hybrid so don't expect 'quietness' around it.
Yes, I do hear the 'whiny' noises whenever I open the doors OR after shutting off the engine etc, but my guess is that it is normal unless the service advisor tells you something else. (but then knowledgeable service advisors are hard to find- Atleast my experience with dealers in Dallas is they simply don't care or don't know enough...oh well, I digress).