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Reviving this from the dead to say that my 14 TTS started beeping with 26k miles on the clock. The air oil separator was replaced under warranty, but just in case anybody else is searching for the solution like I was, this isn't just a new car issue.
on my 17 TT I have from the start a small noise on each side of the car in the rear just on rear of the rear wheel
after some investigation under the car the linkage of the variable geometry blade seem "free" on idle
try the "sport mode" on idle this noise is deleted and in normal mode is became............(electric actuator of have a other position an reduce free play)
i think this linkage is ingenired to absorb variable length on high temperature in this area