Congrats KD4 and RT. You will both enjoy your 'Tracs. I am on my second. I have 111k on my '09 and only repairs have been front wheel bearings and the infamous thermostat housing.. The best way to find your door code is to purchase yourself an OBDII reader that can connect to a laptop (or can bluetooth to you phone) and install some software called Forscan. This is cool software anyway as you can get readings on what your trucks computer system is seeing/doing. As for the door code, there will be a "master" code that you can use to then set your own. The door code is a great feature. Forscan can show you the master code. If you have the owners manual then maybe you will get lucky and find the master code stuck in it somewhere. It is a small card.