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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 know about adding changing or programming your Mazda 3 key fobs Note Some keys require programming from a professional locksmith while others do not Be sure to only use official Mazda replacements for your key fob How to Add a Spare Key If youre unable to find a spare key from the dealer when you buy your Mazda 3 or accidentally break the one you have dont worry theres an option to get another key Youll need to use a flathead screwdriver and the CR2025 replacement battery Once youve got these tools and are ready to access the key fob and change the battery Find the auxiliary key release Its located on the underside of the metal portion Its easy to locate The cover that covers the back should come off as soon as you press the button Then you can insert the screwdrivers head into the notch or spacing on the top of the metal component and pull it off Once the auxiliary key has been removed insert your new or spare key into the slot Turn on the ignition and then wait for around five seconds then set it to OFF This will add the new information on the key to the system that will allow it to start your vehicle in the future It is only possible to program three keys in your Mazda 3 The one thing you dont want is to have more than two working key fobs but not be able to get your car started This is a security measure designed to prevent unauthorised users such as valet drivers who are not authorized to use your key and thereby starting your car How do I reprogram a spare key Its a smart idea be aware of how to reprogram an extra key in the event that the original key is lost or stolen This will stop unauthorized persons from getting into your car and causing damage to it This will work with any Mazda You will need two keys that are working for the reprogramming to begin If you dont own two working keys its best to take your vehicle to a dealer to get this completed Start by stepping into drivers seat and close all the doors except the one that is open Insert the first working key into the slot then set the ignition to the ON position Take five seconds before removing the key Repeat with the second 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 storing each key make sure that its working correctly Its a good idea to purchase an extra Mazda 3 key fob particularly if youre a driver who is prone to losing keys or has other issues with it You can find one online or at your local auto store but be sure to read reviews before purchasing so that you can avoid purchasing one thats not compatible with your car How do I change the battery with a spare key Its a nightmare to discover that your key fob has failed and youre not able to unlock your vehicle Luckily its easy to replace the battery and save yourself some money at the dealer The first step is to press the auxiliary key button located on the back of the key fob This will detach the metal key and reveal a slot on each side of the case Press the flathead into one of these slots and then gently push the two halves of the case apart When the battery is completely exposed take it out and place the case somewhere you wont forget it Before you begin be sure that you have a new replacement battery These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden Choosing the right battery will ensure that your key fob is working properly Next put the new battery in place and replace the battery cap Be careful not to scratch the small rubber ring that the battery is placed on Press the two halves together until you hear a 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 mazda 3 key fob replacement wont start if your key is lost or stolen even if you have an extra key fob This is because the fob that you have to be reprogrammed by the dealership to work properly Its a difficult and costly experience So its best to know how to reset the system To reset the system unplug the battery for around 15 minutes This will erase any residual electrical power in the onboard computer The next step is to disconnect the LFECU and demand switch connectors Check for continuity between the terminals To program a new key or a spare place it in the slot and turn the ignition to ON The key should remain in the ignition for around five seconds and then turn off The keys details are now added to the computer in your car and the new fob will start your vehicle You can program up to three fobs but you must only use one at each time This stops unauthorized individuals from copying the key and getting ahold of your car You can purchase a brand new keyfob online however it will still need to be cut and programmed by a dealer