How to Replace the Key Fob Battery in a Ford Crown Victoria

1. Twist a thin coin between the two halves of the remote entry transmitter near the key ring.
2. Do not wipe off the grease on the battery terminals on the back of the circuit board.
3. Remove the old battery.
4. Insert the new battery, following the orientation diagram inside the transmitter, and press it down until fully seated.
5. Snap the two halves back together.

• Do not take the rubber cover and circuit board off the front housing.
• Replacing the battery will not deprogram the transmitter from the vehicle.
• Dispose of the old battery according to local regulations.

Source: 2011 Ford Crown Victoria owner's manual, PDF page 80. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.