Factory places it on the Lift Rod in the trunk. Some owners write it in the owner's manual. If the sticker is not there, you'll need to go to a dealership to get the master code.
thats my question to you
1. Call a Locksmith or 2. Break the window.
The Marquis does not have a standard code. A dealer may be able to supply the factory code for the exact car, unless the code was owner changed.
You just might possibly find a sticker in the trunk somewhere.
You will find a sticker in the trunck with the factory code printed on it.
Just a long shot, but check inside the trunk for a sticker.
To find the keyless entry code for a 2003 Mercury Grand Marquis, you can check the owner's manual, as the code is often listed there. Alternatively, look for a sticker on the driver's side door jamb or the trunk area, where the factory code may be printed. If you can't locate it, a dealership or a locksmith can retrieve the code using specialized equipment.
The keyless entry code for a 2005 Mercury Grand Marquis is typically located on a label attached to the back of the driver's side door panel or inside the trunk, often on the spare tire cover or near the jack. You may also find it in the owner's manual. If the code is not visible, a dealership can retrieve it using the vehicle’s VIN.
Mine was under the trunk lid. When you open the trunk you can see it up underneath towards the back. A white sticker with 5 black numbers on it. '94 Grand Marquis
The default location is on the Trunk Riser inside of the trunk on the left or right side. Look for a sticker.
Ou812
pick it or call a locksmith