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

If you've dropped your key fob on the floor or it stopped working, it's always an excellent idea to keep an extra key available. This article will cover everything you need to be aware of when changing, adding, and programming your Mazda 3 key fobs.

A word of caution: some keys require programming by a professional locksmith or dealer, whereas others do not. Be sure to only use genuine Mazda replacements for your key fob.

How to Add a Spare Key

If you're not lucky enough to receive a spare keys from the dealership when you buy your mazda 6 key 3 or accidentally break your current one, don't worry -- there's still the option of adding another key. To accomplish this, you'll require an incredibly small screwdriver, a flathead screwdriver, and an CR2025 battery that's new. Once you've got these tools, it's time to open up the key fob and replace the battery. First find the auxiliary key release button. It's located under the metal piece and is easy to locate. When you hit the button, the back cover should slide off immediately. Then, you can insert the screwdriver's tip into the notch at the top or into the space and remove the metal part.

Insert your spare or new key into the slot following the removal of the additional key. Turn the ignition on and wait for five seconds, and then turn it to OFF. This will register the new key's information to the system which will allow it to start your car in the future.

It is important to remember that you can only program up to three keys for your mazda replacement keys 3. You don't want to have to use more than two key fobs in order to start your car. This is a security measure designed to stop unauthorized users, like valet drivers from activating your key and starting your vehicle.

How do I reprogram an unrepaired key?

If you have a spare key, it's a good idea to know how to program it if your original key is lost or stolen. This will keep unauthorized people from abusing your vehicle and re-starting it. This method should work on any Mazda but you'll need two working keys to start the reprogramming process. If you don't have the two working keys, you'll need bring your vehicle to the dealership to get it done.

Begin by stepping into your driver's seat and closing the door, except for the one that's open. Insert the first working key in the slot, then turn the ignition to the ON position. Take five seconds before removing the key. Repeat with the second key.

Once you've finished programming your new key, you should have three working 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 consider buying a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can purchase one online or in your local auto store. Be sure to review the reviews before buying so that you don't get the wrong key fob that isn't compatible with your car.

How do I change the battery on a spare key?

There's nothing more frustrating than finding that your key fob battery has failed and you are unable to unlock your vehicle. Luckily, it's easy to replace the battery and save some cash at the dealership.

Press the auxiliary key button on the back of the keyfob. This will release the key's metal cover and reveal a slot on each side of the case. Press the flathead into one of these slots and then gently pry the two halves of the case apart. Once the battery is fully exposed, remove it and set aside the case in a place where you will not forget it.

Before you begin, be sure you have a new replacement battery. They can be found at any store that stocks batteries or at a Mazda dealer close to Winter Garden. The correct battery is essential to ensure that your keyfob works properly.

Replace the cap of the battery and then insert the new battery. Be careful not to damage the small rubber ring the battery is placed on. Press the two halves together until you hear a click.

How do I reset a Keyless Entry System

The Mazda 3 key fob is not just a convenience. It's also a security measure. The car will not start if the key is lost or stolen even if you have a spare key fob. The key fob needs to be reprogrammed by the dealer to make it work again. It can be a stressful and Mazda 3 Spare key expensive ordeal. Therefore, it's advisable to learn how you can reset the system.

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

To program the new key or spare, insert it into the slot and turn the ignition to ON. Keep the key in place for around five seconds and then switch off. The key information is now added to the computer in your car and the new fob is able to start your vehicle. You can program up to three fobs however, you should only use one at one time. This will stop unauthorised people from copying your key and getting ahold of your car. You can purchase a replacement key fob on the internet, but you'll still need to visit an expert locksmith or dealer to cut it and get it programmed.