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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to keep an extra key on hand regardless of whether you lost your keyfob, or it was unable to function. mazda 2 car key replacement www.g28carkeys.co.uk will show you how to add, change, and reprogramme your Mazda 3 keyfobs. Warning: Some keys require programming from an experienced locksmith, whereas others do not. Only use genuine Mazda replacements to replace your key fob. How to add an extra key If you're unable to get a spare key from the dealership when you buy your Mazda 3 or accidentally break your current one, 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've got the tools then it's time to remove the key fob and change the battery. Locate the key release auxiliary. It's located beneath the metal portion. It's easy to locate. The cover on the back should fall off as soon as you press the button. Next, insert the screwdriver's head into the notch, or the spacing at the top of the metal piece and pull it away. After the auxiliary keys are removed, insert the new or spare key into the slot. Turn the ignition on and wait for approximately five seconds, then set it to OFF. This will allow the system to recognize the new key and start your vehicle in the future. It is important to remember that you can only program up to three keys for your Mazda 3. You don't want to have to utilize more than two key fobs in order to start your vehicle. This is a security measure that is designed to block unauthorized users, such as valet drivers, from activating your key and starting your car. How do you reprogram an unrepaired key It's a smart idea to know how to reprogram a spare key in the event that your original key is lost or stolen. This will prevent unauthorised persons from stealing your car and starting it. This will work with any Mazda. You'll need two keys that work to start the reprogramming process. If you don't own two keys that work, it's best to take your Mazda to a dealer to get this done. Begin by stepping into the driver's seat and close all the doors with the exception of the one that is open. Place the first working key into the slot, and then set the ignition to ON. After five seconds, remove the key. Repeat the process with the second key. After programming your new key you should have three keys that start your vehicle in the future. Before placing each key in storage, make sure that it's functioning properly. It's a good idea to buy a spare Mazda 3 key fob, especially if your car is one who has a tendency to lose their keys or has other issues with it. You can buy one online or at a local automotive store. Be sure to review the reviews before buying to ensure that you don't get an item that isn't compatible with your car. How do you change the battery on a spare key It's very frustrating to discover that your key fob has failed, and you are not able to unlock your car. Luckily, it's easy to replace the battery and save yourself some money at the dealership. Press the auxiliary key button at the back of the keyfob. This will take out the metal key and reveal a slot on each side of the case. Put the flathead screwdriver in one of these slots, and gently take apart the two parts of the case. When the battery is completely exposed, take it out and place it in a safe place somewhere safe from being lost. Be sure to have a replacement battery prior to beginning. These batteries can be purchased at any retailer that sells batteries or from a Mazda dealer in Winter Garden. The correct type of battery is crucial to ensure that your key fob functions properly. Replace the cap on the battery and then insert the new battery. Be careful not damage the rubber ring that holds the battery. The two halves should be pressed together until you can hear the click. How to Reset the Keyless Entry System The Mazda 3 key fob is not just a convenience. It also serves as an element of security. If you lose your key or had it stolen, the car will not start even if you have the spare fob. The key fob has to be reset by the dealer to make it work again. It can be a frustrating and costly experience. Therefore, it's advisable to learn how you can reset the system. To reset the system, remove the battery for 15 minutes. This will take out any remaining electricity from the onboard computer. Next, disconnect both the LF-ECU connector and the demand switch connectors. Then, check continuity between the following terminals: Put the key in the slot, and turn on the ignition. Leave the key in for around five seconds, and then turn it off. The key's information has been added to the vehicle's computer and the new fob is able to start your vehicle. You can program as many fobs as you desire however only one must be used at any specific time. This will keep unauthorised individuals from stealing your key and getting access to your car. You can purchase a brand new keyfob on the internet, but it'll still need to be programmed and cut by a dealer.