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Mazda 2 Key Fob Replacement Although it can be a bit frustrating to find a fob that stops functioning, it's quite common and easily repaired. It is usually a an issue of replacing the battery. Batteries can be found at the majority of big-box stores and hardware stores. You can also find instructions in your owner's guide or on YouTube on how to replace the battery by opening the fob. What is a keyless system? The keyless entry feature in your car is a remote control system that allows you lock and unlock the vehicle without needing to insert your keys. It's usually on a key fob, or built into your ignition key handle. Some models even provide the option of remotely locking the tailgate and trunk. The system works by sending an radio signal from the key fob to the car's computer. The car analyzes the radio signal to determine if it's the right key. If it is, the doors will automatically unlock and the engine can be started. The key fob also has a transponder or integrated security chip to prevent the vehicle from starting if an incorrect key is used. While keyless entry systems are convenient, they do come with some disadvantages. They may be activated accidentally by children playing with them, or turned on when the owner isn't present in the vehicle. This can cause the power windows and other features to operate without the owner's permission or knowledge or permission, and it could trigger the alarm in the car. Another reason to be concerned is that there are a multitude of ways thieves can breach the security of keyless entry systems, and then hack the computer system of your vehicle, making it believe your key fob is close enough to be able to start the car. It is vital to have a backup key or fob. How do I replace my keyless entry system? If your car's key fob battery goes out while you're on go, that can be a major hassle. It's simple to change the battery on the Mazda 2 flip key transponder. You'll only need to know how to open the key fob as well as which type of battery you should purchase. You'll need to use an flathead screwdriver wrapped in tape to pry open the case, starting from one side and then the other side, using it gently to avoid damaging it. Once the case has been opened, remove the previous battery. Place the case in a place so that you don't forget it. Replace the battery, orienting it so that the positive side is facing up. It's also a good idea to write down the code number on the back of your manual key, to allow you to program the replacement fob by using it. It is important to note that although you can copy an old car key made of metal at hardware stores of the most recent smart keys require programming from an authorized locksmith or dealer. The cost of a replacement fob, programming and a mechanical back-up key can add up to the total. If you have an auto club membership or insurance policy whether it will pay for the cost. You might be able to save money by purchasing an aftermarket fob on the internet and having it programmed by a locksmith, instead of the dealership. How do I program my keyless entry system? In general, the same steps are used to program key fobs for all major car brands. The procedure for certain cars may be slightly different and may require specialized hardware or computer software. In these cases it is best to read the manual, or contact an authorized dealer for more assistance. Before starting, be sure that you have all the required materials and tools. It is recommended to also go through the instruction manual for the keyless entry system to gain a better understanding of the way it works. Installation is relatively simple, but the cover for the steering wheel needs to be removed to expose the wires needed for the connection. Once you have the required wires connected, it is important to wrap them with electrical tape for protection and insulation. To program a key fob on a new vehicle, insert the original ignition key and turn it to the “ON” setting (not the “start” or “run”) When the key is in the ignition, simultaneously press and hold both the lock and unlock buttons on the new remote for a minimum of 30 minutes. If you've done it correctly your car will sound a chime. The process of programming will also be successful. After successfully programming a new key fob, turn the ignition back to the “OFF” position and test all buttons to make sure they function correctly. How do I change the battery on my keyless entry system? Replace the batteries in your keyfob every few years or whenever you notice that it's less responsive. This is a simple task that can be accomplished in less than 10 minutes. Most of the time you don't have to modify your key fob's settings after replacing the battery. You'll need to ensure you have the right battery in your possession. mazda spare key should be clearly written on the key fob, if you flip it over. If the type of battery is not clear it is possible to open the key fob using an screwdriver with a flat head and examine inside. Key fobs typically accept the CR-1620 batteries, which are widely available in a variety of shops, including Home Depot Walmart & AutoZone. Once you have removed the mechanical key from the key fob, you can easily open it with the help of a screw driver that is flathead or your fingernail. Replace the battery you used with the new one you purchased. The positive (+) side of the new battery should be facing up. Reassemble the two sides and then snap it to shut. Certain key fobs require programming that can only be done with a specific tool that an automotive locksmith or dealer has access to. Non-transponder keys do not require programming, and therefore are a good option for those who do not have the tools to program their vehicle.