I'm considering buying an Audi A3 from 2013, from an official Audi dealership. It's in good condition as far as I can tell, and has all the options I need.
The problem is that they don't have a service history on their system for it (even though the car was bought new there). They told me the previous owner probably thought he had to bring it for service at 20,000 miles or 2 years, and since he did only 18,000 miles maybe thought he didn't need to bring it. It's been serviced now and has no problems, and also comes with one year warranty.
Still, I'm wondering, is this lack of a service history a red flag? Or does it happen often?