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How to Add, Change, and Reprogram a Mazda 3 Spare Key

If you've dropped your key fob on the ground or it simply stopped working, it's a good idea to have an extra key available. This article will explain everything you need to be aware of when adding, changing, and reprogramming your Mazda 3 key fobs.

Note: Some keys require programming by an experienced locksmith, whereas others don't. Only use genuine Mazda replacements to replace your key fob.

How to add a spare key

If you're not fortunate enough to receive a spare keys from the dealer when you buy your Mazda 3 or accidentally break your current key but don't worry, there is still the option of adding another key. You'll need to use a flathead screwdriver, and the CR2025 replacement battery. Once you have the items and tools, you're ready to open the key fob. Locate the auxiliary key release. It's located under the metal piece and is easy to find. Once you hit the button, the back cover will fall off instantly. Then, insert the screwdriver's head into the notch, or the spacing at the top of the metal part and pull it away.

Once the auxiliary key is removed, insert your new or spare key into the slot. Set the ignition to ON, and wait for five seconds before turning it to OFF. This will allow the system to recognize the new key and start your vehicle in the future.


You can only program three keys in your Mazda 3. The most important thing is to have more than two working key fobs, and not be capable of getting your vehicle started. This is a safety measure designed to prevent unauthorised users, like valet drivers, from activating your key and thereby starting your car.

How to Reprogram a spare key

If you have a spare key, it's a good idea be aware of how to program it if your original key is stolen or lost. This will stop unauthorised people from opening your car or stealing it. This should work with any Mazda. You'll require two keys that work to begin the reprogramming. If you don't own two working keys, you'll have to take your vehicle to the dealer to get it done.

Start by stepping into driver's position and shutting all doors, with the exception of the one that is open. Put the first working key into the slot, then turn the ignition to the ON position. After five seconds, remove the key. Repeat the process with the second key.

Once you've finished programming your new key, you should have three keys that you can use to start your car in the future. Before saving mazda spare key , be sure that it's working correctly.

You should consider buying a spare Mazda 3 remote, especially when your car is susceptible to problems. You can purchase one online or in your local automotive store. Be sure to go through reviews prior to purchasing to ensure that you don't purchase a key fob which isn't compatible with your vehicle.

How do I change the battery on a Spare Key

There's nothing more frustrating than discovering that the battery on your key fob gone out and you're not able to unlock your vehicle. It's easy to replace the battery yourself and save money at the dealership.

Press the auxiliary button on the back of the keyfob. This will take out the metal key auxiliary and reveal slots on both sides of the case. Use the screwdriver's flathead to push it into one of these slots and then gently pry apart the two sides of the case. When the battery is fully exposed, remove the case and place it somewhere you will not forget it.

Before you begin, be sure that you have a new replacement battery. You can find these at any store that sells batteries or at an Mazda dealer close to Winter Garden. Choosing the right battery will ensure that your key fob works perfectly.

Replace the battery cap and then replace the battery. Be careful not to damage the small rubber ring that the battery is placed on. Finally press the two halves of the key fob until you hear the sound of clicking.

How do you reset the Keyless Entry System

The key fob inside your Mazda 3 is not only an extra convenience, but also an important security feature. The car won't start if your key is stolen or lost even if you have a spare fob. The key fob should be reprogrammed by the dealer to make it work again. This could be a costly and frustrating experience, so it's a good idea to understand how to reset the system yourself.

To reset the system, disconnect the battery for around 15 minutes. This will clear any residual electrical current from the computer on board. The next step is to disconnect the LF-ECU and demand switch connectors. Check for continuity between the following terminals:

Place the key in the slot and turn the ignition ON. The key should remain in the ignition for around five seconds and then turn it off. The key's information is transferred to the computer of your vehicle and the new fob is able to start your car. You can program as many fobs as desire but only one can be used at any given time. This will prevent unauthorized people from stealing your keys and getting access to your vehicle. You can purchase a replacement key fob online, but you'll still need to go to an expert locksmith or dealer to cut it and programmed.