New to me, 2004 z4 2.5. yesterday on 15 min. Drive, got a yellow brake light with dsc light. Today nothing. I suspect dirty wheel speed sensors, or is this a prelude of weird electrical gremlins to come ?
3 light combo is the yaw sensor....maybe. its under the seat and gets damaged by water. Check the carpets under the seats and see if they are wet. Could be roof drains or door seal if they are wet. Check your roof drains anyway.