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Mazda 2 Key Fob Replacement It can be quite frustrating when a device stops working. However it is a frequent issue that can be fixed easily. It is usually a simple matter of replacing the batteries. Batteries can be found at the majority of big-box stores and hardware stores. You can also consult the owner's manual or on YouTube for directions on how to open the fob and replace the battery. What is a keyless entry system? The keyless entry in your car is a remote-control system that lets you to lock and unlock the vehicle without the need to insert your keys. The keyless entry system is usually mounted on a keyfob integrated into the ignition key handle. Some models even provide the option of locking remotely the trunk and tailgate. The system transmits a radio signal to the computer in your car. The car then interprets the signal to determine whether it is the correct key. If it's the right key the doors will open automatically and the engine will start. The key fob itself also contains an integrated security chip, or transponder, that stops the car from starting when the wrong key is used. Keyless entry systems have advantages and drawbacks. They could be activated accidentally by children playing with them, or switched on when the owner isn't in the car. This could cause power windows and other functions of the car to function without the owner’s knowledge or consent, and may even set off the alarm. There are many ways that thieves could hack into the computer of your vehicle to trick it into thinking that your key fob was near enough to start your car. It is essential to have a working backup key or fob. How do I replace my keyless entry system? It can be a major issue if the key fob battery is damaged while you're driving. Luckily, changing a Mazda 2 transponder flip key's battery is pretty simple. You'll only need to know how to open the key fob and which type of battery you should purchase. You'll want to use a tape-wrapped flathead screwdriver to pry open the case, starting from one side, and then the other, working with care so as to prevent breaking it. After the case has been opened it is possible to remove the battery from the case and place the case where you'll not lose it. Replace the battery, orienting it so that its positive side is facing up. It's recommended to note down the code number on the back of your manual key, in order to program the replacement fob using it. While you can duplicate an old metal key at a hardware store many of the newer smart keys require programming by an expert locksmith or dealer. The cost of a replacement fob, programming and mechanical keys for backup can add up to the total. Check your car's warranty, auto club membership, or insurance policy to see whether they'll cover the expense. You could save money by purchasing a key fob from an aftermarket store online, and then having it programmed instead by a locksmith. How do I set up an entry system that is keyless for my home? In general the same process is used to program key fobs for all major automobile brands. The process for certain vehicles may be slightly different and may require specialized hardware or computer software. In such cases, it would be best to refer to the manual or seek out an authorized dealer for more assistance. Make sure you have all the tools and materials you need prior to beginning. It is recommended that you read the instructions for the keyless system in order to better understand how it works. Installation is relatively simple but the cover for the steering wheel needs to be removed to expose the wires for the connection. Wrapping the wires in electrical tape will protect them and shield them. To program the new key fob, insert the original key into the ignition and then turn it to the “ON” position (not the start or run position). When the key is in the ignition while you hold and press both the unlock and lock button on your new remote for at least 30 minutes. If done correctly, new mazda key fob will chime and the process of programming will be successful. After programming a new keyfob successfully turn the ignition to “OFF” and test all buttons to confirm that they work. How do I change the battery in my keyless entry system? Every few years, or when the key fob becomes less responsive, you'll have to replace the batteries on your key fob. This task can be completed in under 10 minutes. Most of the time you won't even have to reset your key fob after replacing the battery. First, you'll want to ensure you have the proper type of battery on hand. The battery's type should be noted on the key fob in case you flip it over. If it is illegible then you can utilize a small flat screw driver to remove the key fob and inspect inside. Key fobs usually use the CR-1620 battery, which is widely available in a variety of stores like Home Depot Walmart & AutoZone. You can easily unlock the key fob by you have removed the mechanical key. Make use of a flathead screwdriver or your fingernail to do this. Replace the battery you used with the one that you purchased. Make sure that the new battery has its positive (+) side facing upwards and then reassemble the two sides of the key fob and snap them to seal it. Certain keys require programming that can only be done with a specific tool that an automotive locksmith or dealer has access to. Keys that do not have transponders do not require programming, so they are a good option for those without the tools to program their car.