Two problems related to engine shut off without warning have been reported for the 2013 Audi A8. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Audi A8 based on all problems reported for the 2013 A8.
As a slowed to make a turn in an intersection (downtown in a major city) the car started jumping and then the engine shut off in the middle of a major intersection and the steering locked up. I turned on my hazards and luckily no one hit me, but the car would not start up. However, one I gave it some gas while starting the ignition it turned over, but the car died two more times before I could safely park it. I took it to the dealership and they told me my turbos were blown. My car has less than 60k miles, well maintained, and it's only been used as a commuter vehicle.
After traveling 4 hours from savannah, GA to atlanta, GA; I proceeded to get off the interstate on exit 228. Upon getting off the exit, the car shut off without warning. The computer advised to restart the engine, however the car would no longer start. After several attempts, I called to have the car towed as I was in the middle of a busy exit and could not move the car, which was a very dangerous situation. At the dealership, I was advised that both turbos on the engine had gone bad. How could this be, the car only has 38,542 miles on it. This situation could have been a lot worse than it was had the car decided to stall & shut off while still traveling on a busy traffic on i75.