Hello, I also recently had a key problem with my Audi A4, model year 2013. The issue was actually quite serious. In my case, it wasn't the antenna, but the lock on the driver's door that was defective and had to be replaced. My car was in the workshop for a few days to fix it. I hope the problem is smaller for you. Maybe try resyncing the key before you go to the garage. Or test it with a spare key if you have one. Good luck!

(Translated from German)

Hey, thanks for the reply and the tips. So the driver's door lock was the problem for you, hmm... I hope that's not the case for me. Do you remember roughly how much it cost you? And has anything else happened since then or is everything running smoothly now? Best regards!

(Translated from German)

Hey, yes, the lock was the problem with my Audi A4. Unfortunately, the repair cost me a few euros. BUT, good news for you: after I went to the mechanic, the antenna in the bumper, which was actually defective, was made to work again. That reassured me. Fixing the Comfort Access control unit saved me around €600. It was a big job, but since then everything has been running smoothly again. No further problems have occurred. I'll keep my fingers crossed that it won't be that expensive for your Audi A6. Best regards!

(Translated from German)

Hello, Uff, that really sounds like a lot of money. But you're right, the main thing is that it works again afterwards. That's exactly my fear, that it will be expensive. But well, I think I really should go to the garage and have it checked out. Thank you for sharing your experience with me, that helps me a lot! See you then!

(Translated from German)