It doesn't have to be CPO, audi extended the warranty for this issue up to 120k miles. So you can either get it towed to audi or put everything back and drive it there since all cam, follower and hpfp need replacing. I'm not sure if audi covers the towing with this extended warranty.
If you're still CPO they will pay for towing but you have to make sure you call audi of america and get the towing through them not through you audi dealership. I made this mistake and I had to pay for towing.
Now there's another big issue you need to take care of, the missing piece of the follower. It should be around the cam chain tensioner and it can do some damage if not removed. It's possible some damage was already done.
I had the same problem a few years ago. They most likely won't look at it if there's no CEL, but you can do what I did. I told them I want it checked for the piece of mind and pay for the labor. When they will see it they won't charge you anything, Audi will cover everything. So they cannot say no. Read this my thread for more details.
http://www.audizine.com/forum/showth...DATE-NEW-PICS-!!!
Good luck.
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