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Mazda 2 Key Fob Replacement Although it can be a bit frustrating to have a fob stop working, it is fairly common and easily fixed. It is usually a simple issue of replacing the batteries. Batteries can be found in 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 entry system? The keyless entry system that you have in your car is a remote control system that allows you lock and unlock the vehicle without needing to insert your keys. The keyless entry system can be located on a keyfob or integrated into the ignition key handle. Certain models provide the option to remotely lock the trunk and tailgate. The system transmits radio signals to the computer in your car. The car is then able to determine if it's the correct key. If it is it is, the doors will unlock and the engine will be started. The key fob also contains a transponder or integrated security chip that prevents the vehicle from starting if a faulty key is used. While keyless entry systems are convenient, they do have a few drawbacks. They can be accidentally activated by children playing with them or turned on even when the owner isn't in the car. This can cause the power windows and other features to work without the knowledge or consent of the owner or permission, and it could cause the car alarm to go off. Another issue is that there are a number of ways thieves could break the security of keyless entry systems and hacked into the computer in your vehicle to make it believe your key fob is near enough to allow you to start your car. It is important to always have a backup key or fob. What can I do to replace my keyless access system? It could be a huge inconvenience if your key fob's battery fails while you're on the road. G28 Car Keys to replace the battery on the Mazda 2 flip key transponder. You'll need to know how to open the key fob as well as which kind of battery to purchase. Use a tape-wrapped screwdriver to gently open the case, working from one side to the other. Be careful not to break it. After the case is removed, you can remove the old battery. Place the case somewhere that you will not forget about it. Replace the battery, being sure to align it so that the positive side faces towards the upwards. You can also program the replacement fob by writing down the code number on the back of the manual key. While you can duplicate a key made of metal at a hardware shop, many of the newer smart keys require programming by a locksmith or dealer. The cost of replacing a fob, a programming key and mechanical keys for backup can be added to the total. If you have an auto club membership or insurance policy, you should check to see if it can pay for the cost. You may be able to save money by purchasing an aftermarket fob online and having it programmed by a locksmith rather than a dealership. How do I program a keyless entry system to my home? In general, the same steps are used to program key fobs for most major auto brands. However, the procedure for some vehicles may be a little different and might require special hardware or software. In those cases, it would be best to consult the manual or seek out an authorized dealer for assistance. Before starting, make sure to have all the necessary materials and tools. It is recommended to study the manual for the keyless system to gain a better understanding of how it works. The installation process is fairly straightforward however you'll need to remove the steering wheel cover to gain access to the wires needed for the connection. Once you have the required wires in place, it is essential to wrap them in electrical tape for protection and insulation. To program a key fob for the new vehicle, insert the ignition key that was originally used and turn it to the “ON” setting (not the “start” or “run”) When the key in your ignition is turned on simultaneously press and keep holding both the unlock and the lock button of the new remote for 30 seconds. If you have completed the procedure correctly the vehicle will chime. The process of programming is also successful. After successfully programming the new key fob, turn the ignition back to the “OFF” position and test all buttons to make sure they work properly. How do I change the battery on my keyless entry system? Every few years or when the key fob appears to become less responsive, you'll need to replace the batteries on your key fob. This is an easy task that can be accomplished in less than 10 minutes. Most times, you don't even need to reset your key fob after replacing the battery. You'll need to ensure you have the correct type of battery in your inventory. If you flip the key fob over, it should have the battery's name written on it. If the battery's name isn't legible, you can open the key fob with a flat-head screwdriver and check inside. Key fobs typically accept the CR-1620 batteries, which are readily available at many stores including Home Depot Walmart & AutoZone. You can easily open the key fob by taking out the mechanical key. Make use of a flathead screwdriver or your fingernail to do this. Then, take out the old battery, and replace it with the new one you bought previously. Make sure the new battery has its positive (+) side facing up and then reassemble both sides of the key fob, and snap it shut. Some key fobs need programming. This can be done with a special tool, which is only available to locksmiths in the automotive industry or dealers. However, non-transponder keys do not require being programmed, which makes them an excellent choice for those who do not have the tools to program their car.