I just purchased a 2007 A8L with 6500 miles on it that I absolutely love.After driving it 400 milesthe malfunction indicator lamp (yellow engine icon) came on. The car is operating perfectly with no issues. The manual says that this means a malfunction in the engine electronic system. Today is Sunday, the dealership is closed and I am supposed to drive about 100 miles tonight. Any thoughts on the likely cause or severity of the problem and whether or not it is ok to drive the car.?

Since I just saw this and today is the 19th, how did you do with your 100 mile trip?

What was the issue?