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How to Add Change and Reprogram a Mazda 3 Spare Key Whether you dropped your key fob on the floor or it simply stopped working its always a good idea to have a spare key handy This article will teach you how to add change and reprogramme your Mazda 3 keyfobs Note Some keys require programming by a professional locksmith while others do not Use only genuine Mazda replacements to replace your key fob How do I add a spare key If youre not fortunate enough to receive a spare key from the dealership when you buy your Mazda 3 or accidentally break the one you have Dont fret theres a way to add another key To accomplish this youll need a small screwdriver with a flat head and an CR2025 battery thats new Once youve got all the equipment you need its time to open the key fob First find the key release button for the auxiliary key The button is on the bottom of the metal part Its easy to find Once you hit the button the back cover should fall off right away Then you can insert the head of the screwdriver into the notch or space on the top of the metal piece and pull it off Once the auxiliary key is removed insert your new or spare key into the slot Turn the ignition on and wait for approximately five seconds and then turn it to off This will allow the system to recognize the new key and start your vehicle in the future It is only possible to program three keys on your Mazda 3 The final thing you want is to have more than two working key fobs and not be capable of getting your vehicle started This is a security precaution designed to stop unauthorized users like valet drivers from activating your key and starting your vehicle How to Reprogram a spare key If you have a spare key its best to be aware of how to program it in the event the original key you had is lost or stolen This will stop unauthorized persons from starting your car or taking it This process is compatible with any Mazda though youll need two keys working to begin the reprogramming process If you dont have two keys that work you should take your car to a dealer to have this completed Begin by putting yourself in the drivers seat and close the door except for the one thats open Place the first working key in the slot and then set the ignition to the ON position Wait five seconds before removing the key Repeat with the second key Once youve finished programming your new key you should have three working keys that you can use to start your vehicle in the future Test each key to be sure that theyre operating correctly before taking them off mazda key replacement near me s a good idea to buy 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 buy one online or in your local auto store Be sure to read reviews before purchasing so that you dont get a key fob which isnt compatible with your vehicle How to change the Battery on a spare key Theres nothing worse than discovering that the battery on your key fob been damaged and youre unable to unlock your vehicle Luckily its easy to replace the battery and save yourself some money at the dealership Press the auxiliary button on the back of the keyfob This will remove the metal key and reveal two slots on the opposite side of the case The flathead should be inserted into one of these slots and gently pry the two halves of the case apart When the battery is completely exposed remove it and set aside the case somewhere you wont forget it Before you begin make sure you have a new replacement battery You can find these in any store that sells batteries or at a Mazda dealer near Winter Garden Using the correct type of battery will ensure that your key fob operates properly Replace the cap of the battery and then put in the new battery Be careful not damage the rubber ring on which the battery rests Press the two halves together until you can hear the click How do I reset the Keyless Entry System The key fob in your Mazda 3 is not only an added convenience but its also an important security feature The car wont start if your key is lost or stolen even if youve got a spare fob The key fob needs to be reprogrammed by the dealer to make it work again Its a difficult and costly ordeal So its best to learn how you can reset the system Remove the battery from the system for 15 minutes This will eliminate any remaining electricity from the onboard computer Then disconnect the LF ECU and demand switch connectors Verify that the connections are in good order between the terminals Place the key into the slot and turn the ignition ON Switch off the ignition after about five seconds The keys information is added to the vehicles computer and the new fob will start your vehicle You can program as many fobs as you want however only one must be utilized at any given time This will stop unauthorized individuals from stealing your keys and gaining access to your car You can purchase a replacement keyfob from the internet however itll still need to be cut and programmed by a dealer
