Does any one knows how to erase the memory of the 4matic, except for removing the positive of the battery for 15 minutes or bringing the car to a mechanic to connect to the computer. I am looking for a home made device of some sort. I would like to do that because the problem is intermitent and when I erase the memory the system works fine for a few days and then fails again. those few days would be enough to get me trough a snow storm or a difficult situation when they happend. The rest of the time I do not really need the 4 wheel traction. Also the system never fails while I am driving, only when I sart the car after being parked. I had the car check for mechanical failure and my mechanic assure me everything is fine, it is just a sensor playing game on us, presumedly the steering wheel sensor.