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How to Add Change and Reprogram a Mazda 3 Spare Key If youve dropped your key fob on the floor or it has stopped working its always recommended to keep an extra key in your pocket This article will provide everything you must be aware of when the process of adding changing and changing your Mazda 3 key fobs A word of warning Some keys require programming by a locksmith professional or dealer whereas others do not Use only authentic Mazda replacements to replace your key fob How do I add an additional key If youre not lucky enough to receive a spare key from the dealership when you purchase your Mazda 3 or accidentally break the one you have Dont fret there is still the option of adding another key Youll need a flathead screwdriver and a new CR2025 battery Once youve got these tools and are ready to open up the key fob and replace the battery First locate the auxiliary key release button Its located on the underside of the metal component and is easy to find Once you hit the button the cover should slide off immediately Then insert the screwdriver head into the notch on top or the space and pry the metal part off Insert your spare or new key into the slot after removing the accessory key Set the ignition ON and wait for approximately five seconds then set it to OFF This will register the new keys details to the system that will allow it to start your vehicle in the future You can only program three keys to your Mazda 3 The last thing you want is to have more than two working key fobs and not being capable of getting your vehicle started This is a safety measure to stop unauthorised users from activating your key fobs and starting your vehicle How to Reprogram a Spare Key If you have a spare key its best to be aware of how to reprogram it in the event that the original key you had is stolen or lost This will prevent unauthorised persons from stealing your car and starting it This will work with any Mazda mazda 2 key fob replacement ll need two keys that are functioning to begin the reprogramming process If you dont own two keys that work you should take your vehicle to a dealer to have this completed Start by stepping into the drivers seat close all the doors with the exception of the one that is open Turn the ignition on and insert the first working key After five seconds remove the key and repeat the procedure with the second working key After youve completed programming your new key you should have three working keys that you can use to start your car in the future Before you store each key make sure its working properly It is advisable to purchase an extra Mazda 3 remote especially if your car is prone to problems You can buy one online or at your local automotive retailer but make sure to read reviews before purchasing so that you can avoid purchasing a key fob thats not compatible with your car How to change the Battery on a spare Key Its a nightmare to discover that the key fob you used to use has gone out and you are not able to unlock your car Its easy to replace the battery yourself and save money at the dealership Press the auxiliary key button on the back of the keyfob This will take out the metal key that is used as an auxiliary key and expose an opening on both sides of the case Press the flathead screwdriver into one of these slots Then gently pry apart the two parts of the case Once the battery is fully exposed remove it and place the case somewhere that you wont forget about it Be sure to bring a new battery ready prior to beginning These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden Using the right type of battery will ensure that your key fob operates effectively Replace the cap on the battery and then replace the battery Be careful not to damage the rubber ring that holds the battery Press the two halves together until you hear the click How do I reset the systems Keyless Entry System The key fob in your Mazda 3 is not only a convenience its also an important security feature If you lost your key or had it stolen the car will not start even if youve got the spare fob This is because the key fob has to be reprogrammed at the dealership to work once more This can be an expensive and frustrating ordeal and its a good idea to understand how to reset the system yourself Remove the battery from the system for 15 minutes This will remove any residual electricity in the onboard computer Then disconnect both LFECU and demand switch connectors Check continuity between the following terminals Put the key in the slot and turn on the ignition Turn off the ignition after approximately five seconds The information from the key will be transferred to your vehicles 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 one time This stops unauthorized individuals from copying your key and getting ahold of your car You can purchase a replacement key fob online but youll still need to visit a dealer or locksmith to have it cut and programmed