2015 p0299 turbo under boost issue
 

Driving it the other day, and had a pretty sizable loss of power. Then the car started to make a whistling noise along with accelerator pressure. My buddy plugged in his diagnostics coder and the above is what came up as the error message. Anybody have this issue, and if so what was the repair and approximate cost for the repair? Thanks in advance!

Check the Macan Forum (macanforum,com) or rennlist. There are a few causes for lost boost. The simplest is a lose hose.