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Mazda 3 Key Fob It's Not As Hard As You Think
Mazda Key Fob Replacement

A key fob that does not work could mean that you don't have access to your car. The Keylab can easily and cheaply fix the issue.

It's not expensive to replace the battery on your Mazda keyfob. You can either find instructions in your owner's manual or online videos on how to replace it.

How to open the Key Fob of a Mazda Key Fob

If you're Mazda key fob has stopped working as well or the indicator light for operation has stopped flashing, it may be time to replace the battery. Fortunately this is among the easiest tasks to do at home with just a few basic tools.

The Mazda key fob utilizes the CR2025 battery which is available at most retail stores as well as websites selling batteries. They are priced at around $4 for a box of four and are available in various sizes.

You can make use of a tape-wrapped flathead screwdriver to open the Mazda key fob case. Press the button for the auxiliary key on the backside of the fob to remove the auxiliary metal key, then use the screwdriver to remove the case from both sides. Make sure you work slowly to avoid damage to the case and to prevent the screwdriver tip from getting scratched.

Once you've opened the case of the key fob, remove the old battery. Be sure to examine the rubber ring that the battery is mounted to ensure it's in good condition. Then, insert your new CR2025 battery and ensure that the positive side is facing towards you. Replace the case, re-covering the screwdriver. Then put everything back together in accordance with your Mazda CX-5 owner's manual.

Battery Replacement

Mazda key fob batteries are simple to replace, but it is best to do it before the battery has completely died. This can cause the vehicle's ability to start and open the doors to be compromised. This could be risky especially if you have small children in the car.

The battery is at the bottom of the key fob. It's usually larger than a regular coin, and has two terminals. There will be two: a red one marked (+) and a black one marked (-).

Make use of a tape-wrapped flathead screwdriver to pry open the case, first on one side, and finally on the other side. Be careful not to open the case too much, or you could damage the internal components. When the case is removed there is tiny rubber rings that the battery is placed on. The ring is marked with an identification number stamped on it. Keep the code number safe, not in your car, in case you need it in the future.

Once you've replaced the battery then put everything back together. Re-attach the case, and make sure that you re-insert both sides of the key fob case until hearing them click into the correct position.

Ignition Replacement

For the most part it's fairly simple to replace the battery for a car key fob and you can do it at home without having to call an expert. Many experts suggest having an extra battery at home. You can get them at most hardware stores. This will save you the cost of a replacement fob which can be up to $500 for high-end models and $250 for most affordable cars.


If the key is stuck in the ignition, it could be more difficult to get it out. Modern ignitions are complex and require a specific series of actions to function properly. If something causes a disruption to this process, for instance a broken key or ignition lock pin, the ignition may jam and the key could be stuck inside.

If the ignition is damaged, then you'll need it repaired or replaced. This is a complicated task that depends on the model and make of your vehicle. Some dealerships will offer to do this, but it is generally more expensive than going to an independent mechanic.

In addition to the cost of a replacement or rebuilt ignition, you will also have to pay for a locksmith to program the new key. This isn't something you can do at home unless you have an ignition system that is basic.

Key Blanks

The key fob can do more than lock and start the car. It also has features like rolling down the windows, summoning the car if it's in a tight spot and auto-parking. This is why they're useful but they can be frustrating when you lose or break one.

The good news is that most modern key fobs are easy to replace. You can usually do it yourself using a screwdriver as well as an additional battery. Some key fobs emit an alert when they're approaching the end of their lifespan. Experts recommend keeping an extra battery in the center console or in the glove box, and a small screwdriver to open it if you need to change out the battery that's been in use for a while.

Another option is to contact a locksmith who can make you a replacement key. This locksmith might require a key that is working to program the new remote, so locate one that requires evidence prior to starting. You can also purchase a new key fob online with a reputable seller.

If you have a key fob that doesn't function, your insurance might be able to cover it. However, this means that you'll need to purchase a new fob and also your car's deductible and can be costly when the fob cost hundreds of dollars.