The dealer said there was a problem with the gas gauge sensor and was able to correct it (not sure how).

In terms of the navigation system, they said it had some kind of error code. It was reset; unfortunetely that didn't fix the problem. I explained the symptoms I was seeing when I dropped the truck off, and suggested a DVD drive replacement was warranted, but they must not have felt like paying for replacement parts. I guess I will have to make another trip down to the dealer.

This will be my 3rd trip to the dealer for electronics that have broke on this car (09 X5 4.8 with under 9k miles). This will probably be my last BMW until they make some improvements with their electrical systems.