Where can I find code to open door for 2000 Lincoln Navigator?

You can find code to open the door of a 2000 Lincoln Navigator in the owner's manual, which typically includes information on the factory keyless entry code. Alternatively, you can retrieve the code from the vehicle itself, often located on a sticker in the glove compartment or near the driver's side door. If these options are not available, consider contacting a Lincoln dealership or a locksmith for assistance.