need to know the keyless entry to my 1999 mercury grand marquis 4dr that l recently bought at a car lot.

The keyless entry system on a 1999 Grand Marquis is controlled by what is called a Driver is Door Module. This module is bolted to the driver is door. To access it requires removal of the driver is door panel. To do so, simply remove the master control bezel by prying upward, & disconnecting the electrical connectors. Once removed, remove all the screws securing the door panel to the door. Remove the door panel by pulling UPWARD, & then OUTWARD. The module should then be easily visible. On the module will be FIVE large numbers. Those five numbers r ur keyless entry keypad code. Hope this helps.

try the rear seat top side on trunk its a rectangular box with lots of wires on it

if not there try right front kick side panel ,side of glove box

usually the code is on the box its a number sticker,

or take it to a dealer and they will pull the keyless code for a fee