Major service was recently performed (thankfully under warranty) to replace the power control board. I got the car back (after 4 months waiting for a backordered board from Germany) to find my spare key no longer worked. Not only did it not turn on the "ignition" switch, the buttons for door locks, etc. did nothing. I followed the thread for replacing the battery to no avail. It turned out that the key just needed to be re-programmed to the car. The dealer did it for me while I waited and it now seems fine. I was told that they usualy charge $150 for this service, but thankfully I was only out a few hours of my weekend.