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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 has stopped working, it's always an excellent idea to keep an extra key available. This article will tell you how to add, modify or reprogramme the Mazda 3 keyfobs. Warning: Some keys require programming from an expert locksmith, while others do not. Use only authentic Mazda replacements to replace your key fob. How do I add a spare key? If you're not fortunate enough to receive a spare key from the dealership when you buy your Mazda 3 or accidentally break the one you have do not fret — there's an option to make another key. To do this, you'll need an incredibly small screwdriver, a flathead screwdriver, and the new CR2025 batteries. Once you've got all the equipment then it's time to open the key fob. Locate the key release auxiliary. The button is located on the bottom of the metal portion. It's easy to find. Once you hit the button, the back cover will fall off instantly. Then, place the screwdriver head into the notch on top or the space and pry the metal part off. Once the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON, and wait for around five seconds before turning it to off. This will allow the system to recognize the new key and start your vehicle in the future. It's important to keep in mind that you can only program up to three keys on your Mazda 3. You don't want to have to utilize more than two key fobs to start your vehicle. This is a safety precaution designed to prevent unauthorised users, like valet drivers who are not authorized to use your key and thereby launching your vehicle. How do you reprogram an unrepaired key? It's a good idea to know how you can reprogram an extra key in the event that your original key becomes lost or stolen. This will stop unauthorised people from starting your vehicle or taking it. This should work with any Mazda. You will need two keys that are working to begin the reprogramming process. If you don't have two working keys, you'll have to take your vehicle to the dealership to have it done. Begin by stepping into your driver's seat and shutting the door, excluding for the one that's opened. Set the ignition to ON and insert the initial working key. Wait five seconds, then take the key out and repeat the procedure with the second key. Once you've programmed your new key, you should have three working keys that you can use to start your vehicle in the future. Test each key to be sure they're working correctly before putting them away. You should consider buying an extra Mazda 3 remote, especially in the event that your vehicle is prone to problems. It's possible to find one on the internet or at your local auto store, but make sure to read the reviews prior to purchasing so you aren't purchasing the wrong key fob compatible with your vehicle. How to Change the Battery on a spare key It's awful to discover that your key fob has died, and you are not able to unlock your car. Luckily, it's easy to replace the battery and save some money at the dealer. Press the auxiliary key button on the back of the keyfob. This will remove the key that is used as an auxiliary key, and expose a slot on both sides of the case. Place the flathead in one of these slots, and gently pry the two halves apart. Once the battery is fully exposed, remove it and put it away somewhere you won't forget it. Be sure to bring an additional battery before you begin. These batteries can be purchased at any retailer that sells batteries or from a Mazda dealer in Winter Garden. new mazda key fob is vital to make sure that your keyfob functions correctly. Next, put the new battery in its place and then replace the cap of the battery. Be careful not to damage the rubber ring on which the battery rests. Then press the two halves of the key fob together until you hear the sound of clicking. How to Reset a Keyless Entry System The key fob on your Mazda 3 is not only an extra convenience, but also an important security feature. If you lose your key or had it stolen the car won't start even if you've got the spare fob. The key fob should be reprogrammed by a dealer to make it work again. It can be a stressful and costly experience. Therefore, it's advisable to understand how you can reset the system. To reset the system, disconnect the battery for about 15 minutes. This will eliminate any residual electricity from the on-board computer. Next, disconnect both the LF-ECU connector and the 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. Turn off the ignition after about five seconds. The information from the key will be transferred to your vehicle's computer and the new fob will be able to start your car in the future. You can program up to three fobs however, you should only use one at each time. This will prevent unauthorized persons from copying your key and gaining access to your vehicle. You can purchase a brand new keyfob online, however it must be cut and programmed by an authorized dealer.