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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea to keep an extra key in your pocket regardless of whether you lost the keyfob or it stopped working. This article will go over everything you need to know about adding, changing, or reprogramming your Mazda 3 key fobs. Warning: Some keys require programming from an experienced locksmith, whereas others don't. Make sure you only make use of official Mazda replacements for your key fob. How do I add a spare key? If you're not lucky enough to get a spare key from the dealership when you buy your Mazda 3 or accidentally break the one you have do not fret — there's still the option of adding another key. To accomplish this, you'll require an inexpensive flathead screwdriver as well as an CR2025 battery that's new. Once you've got the tools and tools, you're ready to open the key fob. First, locate the auxiliary key release button. mazda spare key www.g28carkeys.co.uk is on the underside the metal portion. It's easy to find. Once you press the button, the cover will fall off instantly. Then, insert the head of the screwdriver into the notch or space on the top of the metal piece and pry it off. After the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON, and wait for about five seconds before turning it to OFF. This will register the new information on the key to the system and allow it to start your car in the future. It's important to know that you can only program up to three keys for your Mazda 3. The one thing you don't want is to have more than two functioning key fobs, and not be capable of getting your vehicle started. This is a security measure designed to prevent unauthorised users, like valet drivers who are not authorized to use your key and thereby launching your vehicle. How do I reprogram an unrepaired key It's a smart idea to learn how you can reprogram a spare key in the event that your original key gets lost or stolen. This will stop unauthorized persons from opening your car or taking it. This should work with any Mazda. You'll require two keys that work to start the reprogramming process. If you don't have two working keys then it's best to bring your Mazda to the dealer to get this completed. Start by stepping into driver's position, and close all the doors with the exception of the one that is open. Set the ignition to ON and then insert the first working key. Then wait five seconds before taking out the key. Repeat with the second key. After you've programmed your new key, you'll have three working keys you can use to start your vehicle in the future. Check each key to make sure that they're operating correctly before taking them off. It's a good idea buy a spare Mazda 3 key fob, particularly if you're a driver who is prone to losing keys or has other issues with it. You can purchase one online or in your local auto store. Make sure you look up reviews before you purchase so that you don't get the wrong key fob that isn't compatible with your vehicle. How do you change the battery on a spare key? It's awful to discover that your key fob has died, and you are unable to unlock your car. It's easy to change the battery yourself and save money at the dealer. Press the auxiliary button on the back of the keyfob. This will remove the key that is used as an auxiliary key, and expose slots on both sides of the case. Press the flathead into one of these slots, and then gently pry the two halves apart. When the battery is completely exposed, remove it and place it in a safe place somewhere that you won't forget about it. Before you begin, make sure you have a brand new replacement battery. You can find these in any store that sells batteries or at a Mazda dealer near Winter Garden. The right type of battery is essential to ensure that your keyfob is working correctly. Replace the cap of the battery and then put in the new battery. Be careful not to damage the rubber ring on which the battery rests. Then, press the two parts of the key fob until you hear the sound of clicking. How do you reset the Keyless Entry System The key fob that you have in your Mazda 3 is not only an added convenience, but it's also an important security feature. The car won't start if the key is lost or stolen even if you have an extra fob. This is because the fob that you have to be reprogrammed by the dealership in order to work properly. It can be a stressful and costly ordeal. Therefore, it's best to learn how to reset the system. To reset the system, unplug the battery for approximately 15 minutes. This will eliminate any residual electricity from the on-board computer. Next, disconnect the LF-ECU and demand switch connectors. Verify the continuity between the next terminals. To program a new key or a spare, insert it into the slot and set the ignition to ON. Stop the ignition after approximately five seconds. The key information is now added to the computer in your car and the new fob will start your car. You can program up to three fobs, however, you must only use one at a time. This will keep unauthorised individuals from stealing your key and gaining access to your car. You can purchase a brand new keyfob online, however it will still need to be programmed and cut by a dealer.