These instructions apply to the DS 4 Mk2 2021-Present. For other models, please choose your vehicle here.
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If the key fob on your DS 4 (2021–present) has lost its range or shows a low-battery message, the coin cell inside is almost certainly flat. It’s a quick swap with a CR2032.
Battery First — What You Need
- A CR2032 coin cell.
- A small flat screwdriver.
If the fob is completely dead you can still start the car: hold the fob against the START button as you press it. The emergency blade inside the fob unlocks the driver’s door.
Replacing the Cell
- Slide out the emergency key blade.
- Use a small screwdriver to remove the button-cell cover (prise gently at the seam).
- Lift out the old cell (don’t touch the terminals).
- Fit a new CR2032, observing the correct polarity.
- Refit the cover and the blade.
Lost Key or Adding a Spare
A cell swap keeps the existing coding. A new key must be coded by a DS / Citroën dealer — there’s no owner sequence.
If a Fresh Cell Doesn’t Help
- Check the polarity — an upside-down cell won’t work.
- Hold the fob to the START button to drive in the meantime.
- Still flagging? A keyless-entry fault can store a code — look it up on autodtcs.com.
Frequently Asked Questions
What battery does the DS 4 key use?
A single CR2032 coin cell.
Do I need to reprogram the key after the swap?
No — the coding is retained for a battery change.
Can I program a new DS 4 key myself?
No — a new key must be coded by a dealer.
The fob is dead — how do I start the car?
Hold the fob against the START button as you press it.
For the service reminder, see our DS 4 service reset guide.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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