What did Audi the dealer say when this is the second time it's happened? A good way to tell if the car has had a major service will be to.loook at the air filter or pollen filter as these should be clean.
Definitely worth a shot with the eBay option. Check the feedback though. The steering wheel is easy to remove but remember to disconnect the battery and leave it disconnected for at least 30 mins before removing it.
Welcome to the forum Christian, you'll find the members on here are a friendly and helpful bunch 🙂
Nice looking a6, you do t see too many blue ones 👍
Cheers
Steve