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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 simply stopped working its always a good idea to have an extra key in your pocket This article will show you how to add modify and reprogramme your Mazda 3 keyfobs A word of caution Certain keys require programming by a professional locksmith or dealer while other keys do not Only use authentic 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 if you accidentally break your existing one Youll need an flathead screwdriver and a new CR2025 battery Once youve got these tools you can access the key fob to change the battery First look for the auxiliary key release button The button is beneath the metal part Its easy to find When you hit the button the cover should be removed immediately Then insert the head of the screwdriver into the notch or space at the top of the metal part and pry it off Insert the spare or new key into the slot after removing the additional key Set the ignition to ON and wait about five seconds before setting it to off This will add the new keys information to the system which will allow it to start your car in the future It is important to remember that you can only program up to three keys on your Mazda 3 You dont want to use more than two keys to start your vehicle This is a safety measure to stop anyone who is not authorized from activating your keys and launching your vehicle How to Reprogram a Spare Key If you have a spare key its a good idea know how to program it if your original key is stolen or lost This will stop unauthorised people from abusing your vehicle and restarting it This will work with any Mazda You will need two keys that are working to begin the reprogramming If you dont own two working keys its best to take your vehicle to a dealer to get this done Begin by getting into your drivers seat and close the door except for the one thats already opened Turn the ignition on and insert the first working key After five seconds remove the key Repeat with the second key Once youve completed programming your new key you should have three keys that will start your vehicle in the future Before saving each key be sure its working properly You should consider buying a spare Mazda 3 remote especially when your car is susceptible to problems You can buy one online or at your local auto store but make sure to read the reviews before buying so you arent purchasing the wrong key fob compatible with your car How to change the Battery on a spare Key Its awful to discover that your key fob has failed and you are unable to unlock your vehicle Its simple to replace the battery yourself and save money at the dealer The first step is to press the auxiliary key button located on the back of the key fob This will remove the key from the metal and reveal an opening on each side of the case Press the flathead into one of these slots and then gently pull the two halves of the case apart After the battery is fully exposed remove the case and put it in a place where you wont forget about it Be sure to have a replacement battery prior to beginning They can be bought at any store selling batteries or from a Mazda dealer in Winter Garden The right type of battery is vital to ensure that your keyfob works correctly Replace the cap of the battery and then replace the battery Be careful not to scratch the rubber ring that holds the battery The two halves should be pressed 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 an extra convenience but also an important security feature If you lose your key or had it stolen the car will not start even if you have the spare fob This is because the fob that you have to be reprogrammed at the dealership to function properly It can be a frustrating and costly process So its best to learn how to reset the system To reset the system unplug the battery for around 15 minutes This will eliminate any remaining electricity from the onboard computer Then disconnect how much is a new mazda key fob ECU connector and the demand switch connectors Then check continuity between the following terminals Put the key in the slot and switch on the ignition Leave the key in for about five seconds then switch off The key information will now be saved to your cars computer and the new fob will be able start your car in the future You can program up to three fobs however you must only use one at a time This will stop unauthorised people from copying the key and gaining access to your car You can buy a new keyfob online but itll still need to be cut and programmed by a dealer
