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

Whether you dropped your key fob on the floor or it just stopped working, it's recommended to keep an extra key available. This article will go over everything you must learn about adding, changing, or programming your Mazda 3 key fobs.

A word of warning Certain keys need to be programmed by a professional locksmith or dealer, whereas other keys don't. Make sure you only use genuine mazda 6 Replacement key replacements for your key fob.

How to Add a Spare Key

If you're not lucky enough to receive a spare key from the dealer when you purchase your mazda cx 5 key replacement 3 or accidentally break the one you have, don't worry -- there is still an option to get another key. You'll need to use a flathead screwdriver, and the CR2025 replacement battery. Once you've got these tools, it's time to open the key fob and change the battery. Find the key release auxiliary. It's located underneath the metal piece and is easy to locate. The cover that covers the back should come off the moment you press the button. Next, insert the screwdriver's head into the notch, or the spacing at the top of the metal part and then pull it off.

After the auxiliary keys are removed, insert the new or spare key into the slot. Set the ignition to ON and wait about five seconds before setting it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future.

You can only program three keys on your Mazda 3. The final thing you want is to have more than two functioning key fobs, and not be in a position to get your car started. This is a security measure designed to prevent unauthorized users, such as 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 in the event your original key is lost or stolen. This will stop unauthorized persons from starting your car, or taking it. This procedure should work with any Mazda however you'll need two keys that work to begin the reprogramming. If you don't own two working keys, it's best to take your Mazda to the dealer to get this done.

Begin by putting yourself in the driver's seat and shutting the door, excluding for the one that's open. Turn the ignition on and insert the initial working key. Take five seconds before removing the key. Repeat with the second key.

Once you've finished programming your new key, you should have three keys that you can use to start your vehicle in the future. Before you store each key, make sure that it's working correctly.

You should think about purchasing an extra Mazda 3 remote, especially when your car is susceptible to problems. You can find one online or at your local auto retailer, but make sure to read the reviews prior to purchasing so you aren't purchasing a key fob that's not compatible with your vehicle.

How to change the battery on a spare key

There's nothing more frustrating than discovering that the battery on your key fob failed and you are unable to unlock your car. It's easy to replace the battery yourself and save money at the dealership.

The first step is to press the auxiliary key button on the back of the key fob. This will release the metal key auxiliary to reveal two slots on the sides of the case. Put the flathead into one of these slots, and then gently pull the two halves apart. When the battery is completely exposed, take it out and place the case somewhere that you won't forget about it.

Make sure you have an additional battery before you start. These batteries can be purchased at any store that sells batteries or from a Mazda dealer in Winter Garden. Choosing the correct battery will ensure that your key fob is working perfectly.

Replace the battery cap and then put in the new battery. Be careful not to damage the rubber ring on which the battery rests. The two halves should be pressed together until you hear a click.

How can I reset the Keyless Entry System

The Mazda 3 key fob is not just a convenience. It also serves as an element of security. The car won't start if the key is stolen or lost, even if you've got a spare key fob. The key fob has to be reset by the dealer to allow it to work again. It can be a stressful and costly ordeal. Therefore, it's recommended to learn how you can reset the system.

To reset the system, disconnect the battery for around 15 minutes. This will eliminate any remaining electric current from the onboard computer. Then, disconnect both the LF-ECU connector and the demand switch connectors. Check for continuity between the following terminals:

Insert the key into the slot, and switch on the ignition. The key should remain in the ignition for about five seconds and then turn it off. The key information will now be added to your vehicle's computer, and the new fob will be able to start your car in the future. You can program as many fobs as desire but only one can be used at a specific time. This will stop unauthorized individuals from stealing your key and getting access to your car. You can purchase a brand new keyfob online, but it still needs to be programmed and cut by an authorized dealer.