Mazda CX-3 Key Fob Battery Remote Replacement DIY Years 2016-2019

The Mazda CX-3 was released at the end of 2015 to replace the Mazda 2 in the North American market. This subcompact vehicle comes with Mazda’s smart key. The smart key fob allows you to lock, unlock, or panic your Mazda CX-3 remotely with the smart key. What’s really “smart” about it is that you can unlock or start your vehicle while the key is in your pocket. Your CX-3 will detect your smart key based on its proximity and grant you access. This Mazda key fob also comes with a handy removable key for when your battery dies.

Speaking of your battery dying, let’s get into why your really here—to change the internal battery in your CX-3 key fob! In this guide, we will show you everything you need to know to get your battery changed and get back out on the road in no time. Looking for a different Mazda key fob?

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CX-3Smart Key2016, 2017, 2018, 2019CR2025Check on Amazon

How to replace the Mazda CX-3 2016, 2017, 2018, 2019 Smart key fob battery

This smart key fob can easily be opened to replace the CR2025 battery inside. Scroll down to see a full video tutorial or read on for a step by step guide.

What you will need:
• 1x CR2025 battery
• Flat-head screwdriver

First, flip your smart key over and find the small switch on the back. Push the switch down, and while holding it down, pull on the silver key ring hole to release the internal key. From here, we will need our flat-head screwdriver. Locate the grooves on the left and right walls inside the area the key came from. Insert your screwdriver into a groove and twist to loosen that side. Repeat for the groove on the other side. This will begin to separate the two halves of the key fob.

Now, there should be a separation between the two halves running down the seams on the long sides of the smart key. Insert your screwdriver into these seams, twist, and work your way down each side until you can separate the two halves of the key fob. Inside, you will find a plastic disc, remove it with your fingers to expose the battery. The CR2025 battery can simply be removed with your fingers.

Place your new battery in the compartment with the face UP. Put the plastic disc back on top of the battery, click the two halves of the key fob back together, and insert your internal key. That’s it! Battery replaced. Good job.

Mazda CX-3 Smart Key Fob Battery Replacement (2016 - 2019)
This is the battery for this CX-3 key fob:


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Energizer 2025 Batteries, Lithium CR2025 Battery, 2 Count
  • Energizer 2025 Lithium Coin Battery
  • Delivers long-lasting, dependable performance in specialty devices like heart rate monitors, remotes, keyless entry systems, glucose monitors, toys, and games.Operating temperature:-30C to 60C
  • Holds power for up to 10 years in storage, ensuring you have Lithium Coin Batteries ready when you need them

GIF Visual Guide

In this video, I'm going to show you how to change the battery on the key Fob for the Mazda CX-3. And this Fob was used from 2016 to 2019 and carries a CR 2025 battery. So to start, just flip it over, locate this little lever on the back and push it down to remove the valet key. And if you look on the inside here, you're going to see a little groove that you can put a regular flathead screwdriver in. Give it a little twist, just gently, and it will open up on that side.

You're going to do it for the other side, just finding that little groove, twisting. And now in that opening, do the same. Just gently move down, give it a little twist and it will pop right off. And now you can remove this piece of plastic holding in the battery. And there you can see is our CR 2025 battery.

Go ahead and get your replacement. Just slide it in like that. Make sure this little piece of rubber is securely in its place. And just place it on the top of the battery. Take the back and you can just pop it right back on.

And you can put your key back in and you're good to go. Now, let's say you're in a pinch and you don't have a screwdriver. I'm going to show you how to access this just with your hands, with the tools you have. And so if you just go in with your fingernail right on this corner, it's actually pretty easy to do the same thing as before and just create that little opening. Come over, do the same on the other side.

Both sides are open. Use the key, put it in about half way, and you're just going to twist.

Just give it a twist like that and you're back inside. You can replace your battery, no problem. Put it back on. And there you go. That's the Mazda CX-3 replacement battery.