Ou812
Look on the trunk lid support arm.
Check inside the trunk, on the lid arm.
thats my question to you
There should be a sticker on the underside of the trunk lid - that's where it was on my 92 grand marquis
You cannot reprogram it. A dealer can get you the Master Code if you've lost it.
To reset the keyless entry system on a 1997 Mercury Grand Marquis, start by disconnecting the vehicle's battery for about 10 minutes. Then, reconnect the battery and enter the vehicle. Press the "1" and "2" keys on the keypad simultaneously, which should reset the system. After this, you can program new codes if desired.
On the 1999, it's on the trunk hinge on the passenger side. Open the trunk and take a look. It'll be the easiest place to check without removing anything.
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
1st step check fuses
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.