For 550 owners - check the vacuum valve in the trunk ( left side behind the cover ). Mine was stuck due to dirt/dust been sucked in. It will cause the boost pressure to fail or fluctuate.
__________________
2016 435d xDrive
Previous:2019 M340i, 2014 335dx,2012 M5,2011 550ix,2008 M3,2007 330xd,2005 M5,2004 545iA,2000M5.
|