Audi TT MK1 AUQ Boost leak test

[@dariusmarlatt8273]

The noise comes from where your oil is?

[@henriruutinen1817]

That's correct, that's where the air escapes from and it's completely normal. No boost leak found during this test. I was getting the p0171 code and suspected this might be the case, but in the end it was a leaking downpipe.