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I am going to say 'blown turbo'. As I understand it, they needs replacing every few years. They are susceptible to heat and incredible revolutions. They have to be lubricated, the seals go, and you get smoke.
I had the same problem, I researched the heck outta it and this is what I came across. The crank case control valve is bad, the newer models of our car has a lawsuit that was settled, but Audi won't recognize the older models having the same issue. So I complained to the dealer, what they fixed was the vacuum pump which was covered under my warranty. It's too early to tell if it fixed the issue it's only been 1 week. I hope this helps.
Thermostat has failed (stuck open) and needs replacement. It's a big job (5-6 hours charged labor for a shop), and requires the front of the car to be removed. Here's a pic of my car (B5 A4) a few weeks ago when I changed mine:
might need to be replaced it could be faulty might be able to be fixed put recomend get replaced cause if u get it fixed chances are same thing could happen again so just get replaced its safer and more reliable