These instructions apply to the Vauxhall Mokka Mk2 (P2QO) 2020-Present. For other models, please choose your vehicle here.
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A weak key is the usual reason a Vauxhall Mokka Mk2 (2020–present) — Opel Mokka — stops locking from a distance or asks you to hold the fob to the start button. The Mokka key takes a single CR2032.
Battery You Need
A single CR2032 3 V coin cell for the keyless ‘smart’ fob. If you have a plain remote key, check the cell you remove — some take a CR1620 — and match it.
How to Replace the Key Battery
- Slide out the emergency blade using the release catch.
- Use the slot (or a small screwdriver) to split the fob and reach the cell.
- Lift out the old coin cell, noting which way up it sits.
- Fit the new CR2032 the same way up, observing polarity.
- Clip the fob together and slide the blade home.
Lock and unlock from a few metres to confirm.
If It Still Won’t Work
- Start the car anyway — hold the fob against the start button as you press; the car reads the transponder directly.
- Lock manually with the emergency blade in the driver’s door.
Frequently Asked Questions
What battery does the Vauxhall Mokka key take?
A CR2032 for the keyless smart fob; older remote keys may use a CR1620 — check the one you remove.
Do I need to reprogram the key after changing the battery?
No — it pairs again as soon as power is restored.
How do I open the Mokka key?
Slide out the emergency blade, then split the fob using the slot or a small screwdriver.
My key still won’t start the car — what now?
Hold the fob against the start button as you press it.
For a no-start with a warning light, check the code on autodtcs.com. See also our Mokka battery guide if the car is dead.
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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