I am the owner of a 05 E60 535d sport. For the last 6 months I have been having an intermittent problem with the car going into "idle" mode when it has been driven hard, most common when I it is revved near redline in 4th gear. If car is immediately turned off then on again, problem is cleared. I have had it serviced since then but no fault code ever appears as it isn't in the idle mode. I finally got round to reading the fault code today when in idle mode and it is flagging up 428b (boost pressure control deviation too high). Would anyone be able to tell me what would be my next best step forward. Least cost options first!!! Any help muchly appreciated.
scottypat
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