I have a 2000 528i that these lights have come on recently, with the speedometer intermitently stops working. We replaced both rear wheel sensors: nothing. I took it in to a local garage who does work on foreign models and they thought $1000 worth of work "might" fix it - by replacing the control unit. Please, just tell me what I should do and how this can be fixed. If they can't guarantee that it will work, I certainly am not going to invest that kind of cash. Thank you so much for your advice.