On the more technical code readers it should be able to read historic codes. As the car should store them once they appear even if the car has managed to find a way around the problem. I'd still be getting it checked if it were mine.
Right I'll be attending but not in my Audi as the rear shock sheared from its mounting! This happen right after it was washed, fueled and packed ready to go. So when I meet you I'll be in a blue Ford kuga 66 plate.