The dealership that I work for somehow lost both "keys" for a 2005 Lexus SC430 a couple of months ago. The "keys" are those transmitter types that you keep in your pocket adn hit a start button. Well they had to have the keys ordered, replace BCM, and ECU aswell to get it run again. Total cost $2,700 for 2 keys and to get the car running again. Ain't technology GREAT!