A Productive Rant About Mazda 3 Key Fob Mazda Key Fob Replacement

If your key fob doesn't function means that you won't have access to your car. Luckily, a locksmith is able to fix this problem easily and cost-effectively.

It's not too expensive to replace the battery in your Mazda keyfob. The owner's guide should include instructions or online videos on how you can do it yourself.

How to Open the Key Fob of a Mazda Key Fob

If you've noticed that your Mazda key fob isn't working as easily, or its indicator of operation is no blinking, you may require a new battery. Fortunately this is among the easiest repair s you can do at home using just a few basic tools.


The Mazda key fob uses the CR2025 battery that is available at most retail stores as well as websites that sell batteries. They cost around $4 for a box of four, and are available in various sizes.

Open the Mazda key fob by using an affixed flathead screwdriver. Press the auxiliary key button on the back of the fob to remove the auxiliary metal key, then use your screwdriver break the case on both sides. Make sure to work slowly to avoid damage to the case, and to keep the screwdriver's tip from getting scratched.

After you've opened the key fob case, remove the battery. Make sure that the rubber ring the battery is affixed to is in good condition. Then, you can insert the new CR2025 battery, making sure the positive side is facing up toward you. Replace the battery, then cover the screwdriver. After that, put everything back together according your Mazda CX-5 owner's manual.

Battery Replacement

Mazda key fobs are simple to replace. However, it is best done before the battery has completely failed. Otherwise, it can cause the car to be unable to unlock doors or start the engine. This can be dangerous particularly if you have small children in your vehicle.

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

Use a tape-wrapped flathead screwdriver pry open the case, first on one side, then on the other side. Do not press the case to open or you risk damaging the internal components. After the case has been removed you will see tiny rubber rings that the battery is placed on. The ring has an identification number engraved on it. Place the code number in a safe location away from the vehicle, for future reference when needed.

After replacing the battery and put it back together, you can put it back together. Re-attach the case, and be sure that you re-insert both sides of the key fob case until you can hear them click into place.

Ignition Replacement

It is possible to replace the car key fob batteries at home without the need of a professional. Many experts recommend having an extra battery in your home. You can purchase them at most hardware stores. This will reduce the expense of buying a new fob, which can cost up to $250 or more for the most basic vehicles, and $500 or more for the most expensive models.

If the key is stuck inside the ignition, it could be much more difficult to remove. Modern ignitions are sophisticated systems that require a series of movements to function correctly. If something interrupts this process, such as a broken key or an ignition lock pin, the ignition could stop working and the key could be trapped inside.

If the ignition is damaged, then you will need to have it replaced or rebuilt. This is a complex task, and will depend on the make and model of your car and the make. Some dealerships offer this service, but it's typically more expensive than hiring an independent mechanic.

You'll need to pay a locksmith for the programming of the new key, as well as the cost of replacing or rebuild the ignition. Unless your car has an ignition system that is basic this will be impossible to accomplish at home.

Key Blanks

The key fob does more than just lock and start the car. It also features features such as opening the windows, summoning the car if it's in a tight spot and auto-parking. This is why they're so useful, but they can also be a bit frustrating if you have to replace or break one.

It's important to know that modern key fobs can be easily replaced. You can often do it yourself using a screwdriver as well as a new battery. Certain key fobs emit a warning when their lifespan is approaching the expiration date. Experts suggest keeping an additional battery in the center console or in the glove box. Also, you should have small screwdrivers to open it in case you need to swap out the battery that's been in use for a while.

A locksmith can also give you a new key. They may require a working key from your vehicle to program the new fob, so it is important to find a locksmith who asks for proof of ownership or registration prior to when they begin. You can also buy an online key fob with a reputable seller.

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