What they told me over the phone is that they discussed the fault code with BMW North America, who advised them of a service advisory that requires the DME to be replaced.

This work is being done by a very reputable dealer IMHO, and they have never BS'd me over anything. I would say that since the car was built only four weeks ago, the service advisory must be brand new- otherwise why would they install a faulty part?

I hope to have the car today, but the part did not arrive yesterday. I will post the service info when I get the car back.