Oh that is probably an interval service light. It's nothing. They used to have Service I, Service II, Service III for different intervals of your car where they would check certain things. Even the dealership doesn't do that anymore -- they will tell you to come in when the car says to for a problem.
I'm assuming you don't have iDrive. But do this to reset:
1) Turn on ignition
2) Hold trip odometer button for 5 sec until you see the CBS icons displayed
3) Cycle through them with the stalk (I think its the actual BC button you press - but don't hold unless you want to reset that function).
4) When you get to one you want to reset, press and HOLD the BC button. You'll momentarily see a clock icon while it resets.
That should change you to the next cycle in 30K mi or so.
Under Check Control, do you have any other codes?
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