I just got an 04 Explorer Sport Trac and it didn't come with the door code. I removed the defrost vent and looked under the dash from outside the truck. You can just see it written on the white box there. You might have to lift the wiper up to see properly. Took me about 15 minutes, but I was being extra cautious about not breaking the vent and using a small screwdriver. I'd recommend a thicker screwdriver to pop the vent out easier.