How to Replace the Key Fob Battery in a Ford Mustang

1. Insert a screwdriver in the position shown and carefully remove the old battery.
2. Insert a new battery with the + facing upward.
3. Put the battery cover back on the remote control and install the key blade.

• Replacing the battery does not erase the programmed key; the remote works as normal.
• Do not wipe off grease on the battery terminals or the back surface of the circuit board.
• A message appears in the information display when the remote control battery is low.

Source: 2026 Ford Mustang owner's manual, PDF page 77. 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.