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How to Add Change and Reprogram a Mazda 3 Spare Key Whether you dropped your key fob on the ground or it just stopped working its always best to have an extra key in your pocket This article will explain how to add change or reprogramme your Mazda 3 keyfobs A word of caution Certain keys require programming by a professional locksmith or dealer whereas others dont Make sure you use only official Mazda replacements to replace your key fob How to Add a Spare Key You can also add an additional key in case you dont have a spare key available or when you accidentally damage the one you already have Youll need to use a flathead screwdriver and a new CR2025 battery Once you have the items and tools youre ready to open the key fob Locate the key release auxiliary Its located on the underside of the metal part and is easy to locate Once you hit the button the back cover should be removed immediately Then insert the screwdrivers head into the notch or space at the top of the metal component and pull it off Once the auxiliary key is removed insert the new or spare key into the slot Switch the ignition on and then wait for around five seconds and then turn it to OFF This will register the new keys information to the system which will allow it to start your vehicle in the future Its important to keep in mind that you can only program up to three keys on your Mazda 3 You dont want to utilize more than two key fobs in order to start your vehicle This is a security precaution that is designed to block unauthorized users like valet drivers from activating your key and starting your car How to Reprogram a Spare Key Its a smart idea know how to reprogram a spare key in the event that the original key is lost or stolen This will keep unauthorized people from getting into your car and causing damage to it This process is compatible with any Mazda however youll require two keys working to begin the reprogramming If you dont have two working keys you should take your Mazda to the dealer to have this done Begin by getting into your drivers seat and shutting the door excluding for the one thats been opened Insert the first working key in the slot and then set the ignition to ON Take five seconds before removing the key Repeat the process with the second key After you finish programming your new key youll have three keys that allow you to start your vehicle in the future Before you store each key make sure its working properly It is advisable to purchase a spare Mazda 3 remote especially if your car is prone to problems You can find one online or at your local auto store but be sure to read reviews before buying so you arent purchasing an item that isnt compatible with your vehicle How to Change the Battery on a Spare Key Its depressing to find out that your key fob has died and you are in a position to not unlock your vehicle Its easy to change the battery yourself and save money at the dealership Press the auxiliary button on the back of the keyfob This will remove the key from the metal and reveal two slots on the opposite side of the case Place the flathead in one of these slots and gently pry the two halves of the case apart Once the battery is fully exposed remove the case and place it in a place where you wont forget about it Before you start make sure that you have a brand new replacement battery You can find these at any store that sells batteries or at an Mazda dealer near Winter Garden The right type of battery is crucial to make sure that your keyfob functions correctly Replace the cap on the battery and then put in the new battery Be careful not to scratch the rubber ring on which the battery rests Press the two halves together until you hear the click How do I reset the Keyless Entry System The key fob on your Mazda 3 is not only an option for convenience its an important security feature If you lose your key or had it stolen the car will not start even if it has the spare fob The key fob needs to be reprogrammed by a dealer to allow it to work again It can be a frustrating and costly ordeal So its best to learn how you can reset the system To reset the system unplug the battery for 15 minutes This will clear any residual power from the onboard computer Then disconnect the LF ECU and demand switch connectors Check continuity between the following terminals Place the key in the slot and turn the ignition ON The key should remain in the ignition for around five seconds and then turn off The keys information is transferred to the computer of your vehicle and the new fob can start your car You can program any number of fobs you want however only one must be utilized at any given time mazda car keys replacement stops unauthorized individuals from copying the key and getting ahold of your car You can purchase a new key fob on the internet but youll still need to visit a locksmith or dealer in order to get it cut and programmed