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A Rewind: How People Talked About Mazda 3 Key Fob 20 Years Ago
Mazda Key Fob Replacement

If your key fob does not function, you may not be able get into your car. A locksmith can easily and inexpensively solve this issue.

It's not too expensive to replace the battery on your Mazda keyfob. Your owner's manual should provide instructions or online videos about how to do it yourself.

How do I open a Mazda Key Fob

If you've noticed that your Mazda key fob isn't working in the same way, or that its operation indicator light is no blinking, you may require a new battery. Fortunately, this is one of the easiest tasks to do at home, using only a few basic tools.

The Mazda key fob is powered by the CR2025 and is sold in all stores or on websites that sell batteries. They cost around $4 for a pack of four, and are available in different sizes.

You can use a tape-wrapped flathead screwdriver open the Mazda key fob case. Press the button for the auxiliary on the fob's backside to remove the auxiliary keys made of metal and then use the screwdriver on both sides of the case to open the case. Make sure to work slowly to avoid damage to the case, and to safeguard the screwdriver's tip.

After opening the case for the key fob, take out the old battery. Make sure the rubber ring the battery is attached to is in good working order. Then, insert your new CR2025 battery to ensure that the positive side is facing towards you. Replace mazda 6 key fob by re-covering the screwdriver. Then put everything back together in accordance with your Mazda CX-5 owner's manual.

Battery Replacement

Mazda key fobs are easy to replace. However, it is best done before the battery has completely failed. Otherwise, it could cause the car to lose its ability to unlock doors and start the engine. This can be quite dangerous especially if you've got small children in the vehicle.


The battery is on the bottom of the key fob. It's usually larger than a standard coin, and comes with two terminals. There are two terminals coins: one marked with red (+) and a black one with a minus sign. (-).

Use a screwdriver that is taped first to open the case on one side, and then the other side. Be careful not to force the case open, or you risk damaging the internal components. When the case is removed you will see a small rubber ring that the battery sits on. The ring has a code number stamped on it. Store the code number in a safe location, not in the vehicle, in case of future reference in the event of need.

After 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 you can hear them click into the right place.

Ignition Replacement

It is possible to change the car key fob batteries at home without the need of an expert. In fact, a lot of experts recommend keeping a spare battery in your car and you can find them at a majority of hardware stores. This will cut down on the cost of a new fob, which could cost up to $250 or more for the cheapest cars, and $500 or more in the case of luxury models.

But, if the key is stuck inside the ignition, it may be a lot more difficult to take it out. Modern ignitions are complicated systems that require a series of movements to function efficiently. If something interrupts this process, for instance a broken key or an ignition lock pin, then the ignition can become jammed and the key may get stuck inside.

If the ignition is damaged, then you'll need it replaced or rebuilt. This is a complex task, and it will depend on the make and model of your vehicle and the brand. Some dealerships are willing to do this, however it's typically more expensive than hiring an independent mechanic.

In addition to the cost of the replacement or rebuilt ignition, you will have to pay for a locksmith to program the new key. It is not something you can do at home unless the car has an ignition system that is basic.

Key Blanks

The key fob can do more than lock and start the car. It also includes features like sliding down the window, summoning the car if it's stuck in a tight spot, and auto-parking. They're extremely useful but can also be frustrating when you lose or damage one.

It's good to know that the majority of modern key fobs can be replaced easily. You can typically do it yourself with screwscrews and an additional cell. Some key fobs also emit an alert when they're close to the end of their life. Experts recommend keeping an extra battery in your center console or glove box as well as small screwdrivers to remove it if you need to swap out the original one.

A locksmith may also give you a new key. This professional may require a functioning key to program the new remote, so find one that asks for evidence prior to starting. You can also buy an online key fob from a trusted seller.

Your insurance policy may cover a key fob if it's not working. However, going this route means that you'll need to purchase a new fob as well as your car's deductible which can be expensive when the fob cost hundreds of dollars.