Hello i have the same problem from 1800 rpm whistle sound , my mechanic checked vaccum hose pipe line AGR etc. he told me that probably gasket between Turbos is blown 11 62 7 805 457 part number
(Zitat von Moritz) Hello why you change this part ?? i have the same engine and my problem is that abaut 2000 rpm i have some whistle noise and engine code 244c00