I have a 2014 Audi A4 3.0 TDI V6 Black Edition Quattro
The buzzing noise only happens after you have been driving for 2 minutes.
It only happens when the engine is on.
It only happens when its above 19 degrees when temperature is on low the sound fades off
I think it stops when the stop start...
http://www.audi-sport.net/vb/a3-s3-sportback-8p-chassis/149599-guide-how-remove-turbo-clean-sticky-vane-causes-overboost.html
here is the link to the post i found on how to take your turbo off and clean to save you copying and pasting :arco: also you can get the revive cheep on ebay
you may want to try running some revive through it or possibly go through this guidehttp://www.audi-sport.net/vb/a3-s3-sportback-8p-chassis/149599-guide-how-remove-turbo-clean-sticky-vane-causes-overboost.html although it may not be relevant to you as yours is relatively new have you tried...
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