I have owned a 2001 E55 and currently own a 2001 E320T. The range on both remote keys was and is crap. In the US people frequently use the panic button (or lock button if your car beeps when it is remotely locked) to locate one's car in the parking lot. Most other cars can do this from a block and 2 floors away but in my experience the MB's still can't locate the car if the key fob is at point blank range. My E55 even had the antenna (it's in the dome light), key fob, etc. replaced to no avail. Must be some safety thing. Mark