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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to have an extra key at hand in case you lose the keyfob or it has stopped working. This article will teach you how to add, change and re-programme your Mazda 3 keyfobs. A word of caution: some keys require programming by a professional locksmith or dealer, whereas other keys don't. Make sure to use genuine Mazda replacements for your key fob. How to add an extra key If you're unable to receive a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current key Don't fret, there is still the option of adding another key. To accomplish this, you'll require a small flathead screwdriver and a new CR2025 battery. Once you've got all the equipment and tools, you're ready to open the key fob. Locate the key release auxiliary. The button is located on the underside the metal part. It's easy to find. When you press the button, the cover should be removed immediately. Next, insert the head of the screwdriver into the notch or space at the top of the metal component and pry it off. Insert your spare key or a new one into the slot after removing the accessory key. Set the ignition to ON and wait for five seconds before turning it to OFF. This will register the new key's information to the system that will allow it to start your vehicle in the future. You can only program three keys into your Mazda 3. The one thing you don't want is to have more than two working key fobs and not being in a position to get your car started. This is a precautionary measure to stop anyone who is not authorized from activating your keys and launching your car. How to Reprogram a spare key If you have a spare key it's important to know how to program it in the event your original key is stolen or lost. This will stop unauthorized persons from opening your car or taking it. This process is compatible with any Mazda however, you'll require two working keys to start the process of reprogramming. If you don't have two keys that function, you should take your vehicle to a dealer to have this completed. Begin by putting yourself in the driver's seat, and close the door, except for the one that's open. Place the working key into the slot, and then turn the ignition to ON. Wait for five seconds, then take the key out and repeat the procedure with the second key. Once you've programmed your new key, you'll have three keys that you can use to start your vehicle in the future. Before storing each key, make sure it's functioning correctly. You should consider buying a spare Mazda 3 remote, especially if your car is prone to issues. mazda key fobs g28carkeys.co.uk can buy one online or at your local automotive retailer, but make sure to read the reviews before buying so you can avoid getting a key fob that's not compatible with your car. How to change the battery on a spare key It's a nightmare to discover that your key fob has failed, and you are not able to unlock your car. Fortunately, it's easy to replace the battery and save yourself some cash at the dealership. The first step is to press the auxiliary key button that is located on the back of the key fob. This will remove the key made of metal and reveal two slots on the opposite side of the case. The flathead should be inserted into one of these slots and gently pry the two halves of the case apart. Once the battery is fully exposed, remove it and place it in a safe place somewhere you won't forget it. Before you begin, make sure that you have a new replacement battery. You can find these at any store that stocks batteries or at a Mazda dealer close to Winter Garden. The right kind of battery is crucial to ensure that your keyfob works properly. Replace the cap on the battery and then put in the new battery. Be careful not to damage the small rubber ring that the battery rests on. Finally press the two parts of the key fob until you hear an audible click. How to reset a Keyless Entry System The Mazda 3 key fob is not just a piece of equipment for convenience. It's also an element of security. The car will not start if the key is lost or stolen even if you have a spare fob. The key fob has to be reprogrammed by the dealer to allow it to work again. This could be a costly and stressful experience and it's a good idea to learn how to reset the system yourself. To reset the system, remove the battery for around 15 minutes. This will eliminate any residual power from the on-board computer. Next, disconnect the LF-ECU and demand switch connectors. Verify that the connections are in good order between the terminals. To program an entirely new key or spare, insert it into the slot and set the ignition to ON. Switch off the ignition after approximately five minutes. The key information is now added to the computer in your car and the new fob can start your car. You can program up to three fobs but you must only use one at one time. This will stop unauthorized individuals from stealing your key and gaining access to your car. You can purchase a new keyfob online, however it still needs to be cut and programmed by a dealer.