Just a heads-up for others:
I had a space saver folding wheel from an A6 C7, but it doesn't fit in my A6 C8 S6 Diesel.
The issue was mainly due to the subwoofer placement and the overall height of the spare wheel — it simply wouldn’t sit properly in the wheel well.
So even if the size looks compatible, be sure to check the actual fit before relying on it.
Appreciate the welcome! I know the thread is a bit old, but I came across it while looking for a solution myself and noticed the issue hadn’t been resolved publicly. Thought it might still help others who stumble upon it like I did. I’ll definitely contribute more going forward!
On newer Audis like the Q8, Lane Assist is forced on by EU rules, so it won’t stay off after restart. The only workarounds are manual switch-off each drive, or a plug-and-play memory module (e.g. D2C Memory Module) that recalls your last setting.