Details from worksheet:
Faulty Pressure Converter
Duplicated Noise. Found coming from 2nd pressure converter.
Checked all vacuum hoses for leaks. All okay. Replaced pressure converter and tested. Noise Gone.
PRESSURE CONVERTER Part #11747595374
-It is part of the 'vacuum control system'
2013 BMW 550xi Sedan (AW/Black): Current
2011 BMW 335d Sedan (Blue Water/Black) : Retired
2008 BMW 135i Coupe (BSM/Red) & (White/Black) Retired
2007 BMW Z4 M (White/Red): Retired
2003 & 2006 Cadillac CTS : Retired