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Mazda 2 Key Fob Replacement It can be a bit frustrating when a device stops working. However it is a frequent issue that can be fixed easily. In most cases, it's a a matter of replacing the battery. Batteries can be found at most big-box retailers and hardware stores. You can also check your owner's manual as well as on YouTube for directions on how to open the fob and replace the battery. What is a keyless access system? The keyless entry system that you have in your car is a remote control system that lets you to lock and unlock your vehicle without needing to insert your keys. It's typically on an accessory key fob or incorporated into your ignition key handle. Certain models allow you to remotely lock the trunk and tailgate. The system works by sending a radio signal from your key fob to your car's computer. The car is then able to determine whether it is the correct key. If it's the right key, the doors will unlock instantly and the engine can begin. The key fob itself also includes a security chip, also known as a transponder, that stops the car from starting if the wrong key is used. While keyless entry systems are convenient, they come with some disadvantages. Children can accidentally activate them when playing with them, or they can be turned on while the owner isn't in the vehicle. This can cause the power windows as well as other features to be in operation without the owner's permission or knowledge, and it may even trigger the car alarm. Another issue is that there are a variety of ways that thieves could breach the security of keyless entry systems and even hack the computer in your vehicle to make it believe your key fob is near enough to be able to start the car. It is essential to have a spare key or fob. How do I replace my keyless entry system? If your car's key fob battery is dead while you're on the go, that can be a huge inconvenience. Luckily, changing a Mazda 2 transponder flip key's battery is fairly easy. You'll just need to know how to open the key fob, and then which type of battery to buy. You'll need to use a flathead screwdriver that is tape wrapped to pry open the case. Start with one side, then the other, working with care so as to prevent breaking it. Once the case has been opened you can take off the old battery and place the case where you'll not lose it. Replace the battery, turning it so that its positive side is facing up. It's also a good idea to note the code number on the back of your manual key, to allow you to programme the replacement fob using it. While you can duplicate an old metal key at a hardware store many of the more modern smart keys require programming by an expert locksmith or dealer. The cost of a brand new fob, program, and mechanical backup keys can add up. Make sure to check your warranty or auto club membership or insurance policy to determine whether they will pay for the cost. You might be able save some money by getting an aftermarket fob online and having it programmed by a locksmith instead of the dealership. How do I program an entry system that is keyless for my home? In general the same process is used to programme key fobs for the majority of major automobile brands. mazda key programming for certain models might be different and may require specialized hardware or computer software. In these instances you must consult the manual or contact an auto dealer for further assistance. Before you begin, ensure that you have all the required materials and tools. It is recommended to also read the instruction manual for the keyless entry system in order to gain more understanding of how it operates. Installation is fairly easy but the cover for the steering wheel needs to be removed to expose the wires that will be used to connect. Wrapping the wires with electrical tape will shield and keep them in place. To program the new key fob, insert the original key into the ignition and then turn it to the “ON” position (not the run or start position). When the key is in the ignition then simultaneously press and hold both the unlock and lock button on the new remote for a minimum of 30 minutes. If you have successfully completed the process your car will sound a chime. The programming process is also successful. After successfully programming a new key fob, switch the ignition back to the “OFF” position and test all of the buttons to verify that they are working properly. How do I replace the battery in my keyless entry system Every few years or when your key fob is becoming less responsive, you'll have to replace the batteries in your key fob. This is a simple process which can be completed in less than 10 minutes. You don't need to reprogram the key fob every time you change the battery. You'll need to make sure you have the correct battery in your inventory. The type of battery you're looking for should be written on the key fob, if you flip it over. If the battery's type is not visible it is possible to open the key fob using an flat-head screwdriver and look inside. Key fobs usually use the CR-1620 batteries, which are readily available in many stores, including Home Depot Walmart & AutoZone. You can easily access the key fob after you have removed the mechanical key. Use a screwdriver with a flat head or your fingernail for this. Remove the old battery and replace it with the new one that you previously purchased. The positive (+) side of the new battery must be facing upwards. Reassemble the two sides and snap it shut. Some key fobs need programming. This can only be done using a special tool that is only available to automotive locksmiths or dealers. Non-transponder keys do not require programming, and therefore are a good choice for those who don't have the tools to program their car.