Keyless entry
 

I have a 2002 Grand Marquis. It has power locks but does not have keyless entry. Is there a module I can buy to add it?

Thanks

With enough money and time anything can be done. I would think you would have to find a donor car with this feature and pull the drivers door off and look at the cable connections. The paint will not match. Get a shop manual for that year and study the wiring diagrams. It has to be the same model year and even then,, it is a bit of a gamble. This may even require a reprogramming of the PCM to get it to work. even if you get all the physical connections. In my opinion, it isn't worth the effort.