These instructions apply to the Isuzu MU-X Mk1 2013-2020. For other models, please choose your vehicle here.
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If the key fob on your Isuzu MU-X (2013–2020) has gone weak or the central locking has become intermittent, 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.
Replacing the Cell
Without keyless entry:
- Pull out the mechanical key blade.
- Insert a screwdriver and remove the key cover.
- Renew the cell with a new CR2032, correct polarity.
- Refit the cover and the mechanical key.
With keyless entry (smart key): remove the ring, prise off the cover, lift the transmitter and renew the CR2032, then reassemble.
Lost Key or Adding a Spare
A cell swap keeps the existing coding. Key programming requires a diagnostic tool — a replacement must be coded by a dealer or auto locksmith.
If a Fresh Cell Doesn’t Help
- Check the polarity — an upside-down cell won’t work.
- Use the key blade to unlock the door in the meantime.
- Still intermittent? A receiver fault can store a code — look it up on autodtcs.com.
Frequently Asked Questions
What battery does the Isuzu MU-X 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 MU-X key myself?
No — programming needs a diagnostic tool (dealer or locksmith).
The fob is dead — can I still get in?
Yes — use the mechanical key blade to unlock the door.
If the fob stopped working after a battery disconnection, see our MU-X battery disconnect/reconnect 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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