Mercury Grand Marquis key fob battery
13 of the 16 model years listed for the Mercury Grand Marquis have a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 1996-1997Remote (separate)
Not confirmed yet
- 1998Remote (separate)
Not confirmed yet
- 1999-2011Remote (separate)
CR2032
FCC ID CWTWB1U343 / CWTWB1U331Two sites agree: americankeysupply.com and uhs-hardware.com (checked Nov 1, 2026)
Find CR2032 on Amazon
Changing the battery
Separate remote fob
- This remote is its own fob, separate from the metal key, which makes it one of the easier ones to open.
- Look for a screw on the back or a notch on the edge. Remove the screw if present, then twist a coin in the notch to split the case.
- Lift the old coin cell out and press the new one in with matching orientation.
- Snap the case shut and watch for the lights to flash when you press lock at the car.
A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.
Keep spare coin cells away from small children. A swallowed coin cell can burn the throat within hours; if it happens, go to an emergency room at once.