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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 an excellent idea to keep an extra key in your pocket This article will explain everything you must be aware of adding changing or changing your Mazda 3 key fobs A word of caution some keys require programming by a locksmith professional or dealer while others dont Make sure you use only genuine Mazda replacements to replace your key fob How do I add a spare key You can add another key in the event that you dont have a spare key or when you accidentally damage the one you already have Youll need to use a flathead screwdriver and the CR2025 replacement battery Once you have the items and tools youre ready to open the key fob Find the auxiliary key release Its located on the underside of the metal part Its easy to locate The cover that covers the back should come off when you press the button Then insert the screwdrivers head into the notch or the space on the top of the metal piece and then pull it off Insert the spare or new key into the slot after removing the auxiliary key Set the ignition to ON and wait for about five seconds before turning it to OFF This will allow the system to recognize the new key and start your vehicle in the future You can only program three keys on your Mazda 3 You dont want to have to utilize more than two key fobs in order to start your car This is a security precaution that is designed to block unauthorized users like valet drivers who are not authorized to use your key and starting your car How to reprogram a spare key If you have a spare key its important to be aware of how to program it if your original key is lost or stolen This will prevent unauthorized people from starting your car or stealing it This should work with any Mazda Youll need two keys that are working to start the reprogramming process If you dont own two keys that function its best to take your Mazda to a dealer to have this done Start by stepping into the drivers seat and closing all the doors except the one that is open Set the ignition to ON and insert the first functioning key Wait five seconds then take the key out and repeat with the second working key After youve programmed your new key you should have three working keys you can use to start your car in the future Check each key to make sure theyre working correctly before putting them away Its a good idea to buy an extra Mazda 3 key fob especially if your car is one who has a tendency to lose their keys or has other issues with it You can find one online or at your local automobile retailer but make sure to read reviews before purchasing so that you arent buying an item that isnt compatible with your car How do I change the battery using a spare key Theres nothing more frustrating than discovering that the battery in your key fob has failed and you are unable to unlock your car 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 metal key auxiliary to reveal an opening on both sides of the case Press the flathead into one of these slots and then gently pry the two halves apart When the battery is fully exposed take it out of the case and put it in a spot where youll never forget about it Make sure you have a replacement battery prior to starting These batteries can be purchased at any store that sells batteries or from a Mazda dealer in Winter Garden Using the correct type of battery will ensure that your key fob operates effectively Replace the cap on the battery and then insert the new battery Be careful not to scratch the small rubber ring the battery rests on Press the two halves together until you hear the click How do I reset the Keyless Entry System The key fob inside your Mazda 3 is not only an added convenience but its also an important security feature If you lost your key or had it stolen the car wont start even if youve got the spare fob This is because the key fob has to be reprogrammed by the dealership in order to work properly It can be a frustrating and costly ordeal Therefore its recommended to know how to reset the system To reset the system unplug the battery for 15 minutes This will eliminate any remaining electric current from the onboard computer Then disconnect both connectors for the LFECU and the demand switch connectors Check continuity between the following terminals To program a new key or a spare place it in the slot and turn the ignition to ON Stop the ignition after about five seconds The key information is now added to the computer in your car and the new fob will start your car You can program up to three fobs however you should only use one at one time This stops unauthorized individuals from copying the key and gaining access to your car mazda key fobs can purchase a replacement keyfob online however itll still need to be cut and programmed by a dealer