Sounds like either the door was replaced or the original owners manual was replaced with one from another Taurus. 2003 Taurus for sure have a little white or yellow tag up under the dash along the steering column that has the factory door code on it. You may want to verify that with the books code. All you need is a good flashlight and eyeballs that bend a bit! The VIN also gives some info. Use the search feature above to find info and some photos of code strip location.
I went looking for a keypad code for my bros 02 sel a long time ago and i got his to work
your right this might be from another taurus ... who knows.... if i see the keycode then all i have to do is find a matching color door handle and its associated wires to go with it.....?
I do have the autolamps feature....