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I'm having an odd issue with my 2008 R56, 112K miles. Under certain circumstances it throws the following codes:
2D9C - Knock sensor, signal
2D50 - Super knocking
2885 - Boost-pressure control deviation, plausibility
The circumstances are:
1) HOT (like 85F+) or humid (like 100% RH) or hot and humid.
2) Acceleration with 75% or greater throttle with engine RPM starting about 2K.
Never happens when it's cool or dry and almost never if the engine RPM starts above about 3K RPM when accelerating. I can clear the codes and they often will not come back for days or even weeks.
