either your abs sensors are dirty or the module is bad. usually it is the module. there are a couple of guys who repair them. usually around 150 or so. or you can try to do it yourself. just remember that you need an E5 socket. if you don't have one, get it. if you try and use another socket to remove the bolts you will shred them and have to cut the module out. not that i would know what that is like.....