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Old 01-11-2013, 02:48 PM
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dwlink dwlink is offline
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Location: St. Louis
Join Date: May 2007
Posts: 2,605
Mein Auto: 435i Gran Coupe
Could be a DSA valve. Needed mine replaced around 100k. I had similar symptoms which were a rough idle after the engine had fully warmed up. Engine speed would fluctuate between 600 and 800 RPM (M54 - 530i). Did not throw any messages in iDrive until I was taking the car in for repairs (what a coincidence huh).

2015 BMW 435i GC MSport (ED Sept 29, 2014)
2004 BMW 530i (retired)

Last edited by dwlink; 01-11-2013 at 02:49 PM.
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