Having Trouble with Your Mercedes-Benz Key Fob?
If your key fob isn’t working like it used to, it could be a simple fix—a low or dead battery. At Mercedes-Benz of West Covina, we’re here to help you spot the signs of a weak key fob battery and walk you through how to replace it yourself, no service appointment needed.
How to Know When Your Key Fob Battery Is Dying
A failing key fob battery doesn’t always stop working all at once. Watch for these common warning signs:
- Your Mercedes-Benz takes multiple tries to start.
- The fob no longer locks or unlocks your doors.
- The panic button or other remote functions stop responding.
- A dashboard message may appear, warning of a key or battery issue.
If you’re experiencing any of these, it’s a good idea to swap out the battery before you’re left stranded or inconvenienced.
How to Replace Your Mercedes-Benz Key Fob Battery
You can replace your key fob battery in just a few minutes—no special tools or dealership visit required.
- Identify Your Key Fob Type
- Chrome SmartKey® (newer models): Uses one CR 2025 battery
- Original SmartKey® (older models): Uses two CR 2025 batteries
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Follow the Steps for Your KeyFor Chrome SmartKey®:
- Slide the release tab at the bottom of the fob.
- Remove the metal key.
- Insert the key into the slot to pop open the battery compartment.
- Replace the battery with the new one (positive side up).
For Original SmartKey®:
- Slide the latch to release the key.
- Insert the key horizontally into the slot to open the case.
- Replace both old batteries with fresh CR 2025 cells.
Dispose of the used batteries properly—many local recycling centers near Glendora will take them.
Need Help? We’re Here for You
If you run into any issues or just prefer a professional touch, our team at Mercedes-Benz of West Covina can help. Contact our service center for assistance or schedule a visit online. And before you stop by, don’t forget to check out our latest service specials to save on key fob battery replacement and more.