Ford Mustang key battery
S550
2015–2023How to change a smart key battery
- Slide the release catch and pull out the emergency key blade.
- Wrap the tip of a small flat screwdriver in tape or a cloth, put it in the slot the blade leaves and twist gently to part the case. Keep it off the circuit board and contacts.
- Note which way up the old cell sits before you lift it out. It varies by key, so don't assume + is up.
- Fit a new CR2025 the same way up, holding it by the edges. Leave any grease on the contacts.
- Clip the case back together and test the buttons at the car. Most keys work straight away with no reprogramming.
- Keep new and old cells away from children. A swallowed button battery can cause serious injury within two hours.
S197
2005–2014- TransponderNo battery
A key with no buttons has no battery. It starts the car using a chip that needs no power.
- Remote head keyNot confirmed
We haven't confirmed this one. Open the key and read the code on the old cell, then buy the same.
For locksmiths · S550
- KeysSmart key
- Tools confirmed7
- Transponder chipSubscribers
- Programming procedureSubscribers
Questions
Ford Mustang key battery questions
S550 (2015–2023): CR2025 in the smart key; CR2450 in the smart key.