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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt’s a good idea to have a spare key on hand, whether you dropped the keyfob you were using or it stopped working. how to replace battery in mazda 2 key will tell you how to add, alter or reprogramme your Mazda 3 keyfobs.A word of warning Certain keys need to be programmed by a professional locksmith or dealer, while others don’t. Make sure you use only official Mazda replacements to replace your key fob.How do you add an extra keyYou can also add an additional key if you don’t have a spare key or when you accidentally damage the one you have. To accomplish this, you’ll need a small screwdriver with a flat head and a new CR2025 battery. Once you’ve got these items, it’s time to remove the key fob to change the battery. Locate the key release auxiliary. It’s located on the underside of the metal portion. It’s easy to locate. The cover that covers the back should come off when you press the button. Next, insert the head of the screwdriver into the notch or spacing on the top of the metal part and pull it away.Insert your new or spare key into the slot after you have removed the accessory key. Set the ignition to ON, and wait for 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 know that you can only program up to three keys for your Mazda 3. You don’t want to utilize more than two key fobs in order to start your car. This is a security measure to prevent unauthorized users from activating your keys and then starting your car.How to Reprogram a spare keyIf you have a spare key, it’s best to be aware of how to reprogram it in case your original key gets stolen or lost. This will stop unauthorised people from opening your car or stealing it. This procedure should work with any Mazda but you’ll need two keys working to begin the reprogramming. If you don’t have two functioning keys, you’ll need take your vehicle to a dealer to get it done.Start by stepping into the driver’s position, and closing all the doors except the one that is open. Turn the ignition on and insert the initial working key. After five seconds, remove the key and repeat the process 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 that they’re operating correctly before putting them away.It is advisable to purchase a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can buy one online or at your local auto store, but make sure to read the reviews before buying so that you can avoid getting one that’s not compatible with your vehicle.How do I change the battery on a spare KeyThere’s nothing more frustrating than discovering that your key fob battery has been damaged and you’re unable to unlock your car. It’s simple to replace the battery yourself and save money at the dealer.Press the auxiliary key button located at the back of the keyfob. This will detach the key from the metal and reveal an opening on each side of the case. Put the flathead into one of these slots and then gently push the two halves apart. After the battery is fully exposed, remove the case and place it somewhere you will not forget it.Make sure you have an additional battery before you begin. They are available at any store that sells batteries or at a Mazda dealer near Winter Garden. Using the right type of battery will ensure that your key fob functions effectively.Next, put the new battery in place and replace the battery cap. Be careful not damage the rubber ring on which the battery rests. Then, press the two halves of the key fob until you hear a click.How to Reset the Keyless Entry SystemThe Mazda 3 key fob is not just a convenience. It also serves as an important security feature. The car won’t start if your key is lost or stolen even if you have a spare fob. This is because the key fob needs to be reprogrammed by the dealership in order to work properly. It’s a difficult and expensive ordeal. Therefore, it’s advisable to learn how you can reset the system.To reset the system, remove the battery for approximately 15 minutes. This will eliminate any residual electrical current from the computer on board. Then, disconnect both the LF-ECU connector as well as the demand switch connectors. Verify the continuity between the next terminals.To program a new key, or a spare, insert it into the slot and turn the ignition to ON. Leave the key in for about five seconds, then switch off. The key’s details are now added to the vehicle’s computer and the new fob is able to start your vehicle. You can program as many fobs you desire, but only one should be used at any specific time. This will prevent unauthorised people from stealing your keys and getting access to your vehicle. You can purchase a new key fob on the internet, but you’ll still need to go to an expert locksmith or dealer to get it cut and programmed.