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Mazda 2 Key Fob Replacement It can be quite frustrating when a device stops working. However this is a common issue and can be fixed easily. mazda 2 car key of the time, it's just a an issue of replacing the battery. Batteries are available at the majority of big-box retailers and stores. You can also find instructions in your owner's manual or on YouTube on how to replace the battery by opening the fob. What is a keyless entry system? The keyless entry system in your car is a remote control system that lets you to lock and unlock your vehicle without having to physically insert keys. It's typically on the key fob or integrated into the ignition key handle. Some models let you choose to remotely lock the trunk and tailgate. The system works by sending a radio signal from your key fob to the car's computer. The car analyzes the signal to determine whether it is the correct key. If it is, the doors will automatically unlock and the engine can be started. The key fob itself comes with a security chip, also known as a transponder, that stops the car from starting if the incorrect key is used. While keyless entry systems are convenient, they do have some drawbacks. Children may accidentally activate them by playing with them, or they may be turned on while the owner isn't in the vehicle. This can cause the power windows and other features to operate without the owner's knowledge or permission and could even trigger the car alarm. Another issue is that there are a multitude of ways thieves could break the security of keyless entry systems and hacked into the computer of your vehicle to make it believe that your fob is close enough to start the car. It is vital to have a fob or key that is a backup. How do I replace my keyless entry system? If the battery in your car's key fob goes out while you're on moving, it can be a major inconvenience. It's easy to replace the battery on the Mazda 2 flip key transponder. You'll be required to know the proper method of opening the key fob and which type of battery should buy. You'll want to use a flathead screwdriver with tape wrap to open the case. Start with the one side and moving to the other side, using it gently to avoid breaking it. Once the case has been opened, remove the previous battery. Place the case somewhere so that you don't forget it. Replace the battery, turning it so that its positive side is facing up. You can also program your replacement fob by writing down the code number from the back of the manual key. While you can duplicate a key made of metal in a hardware store, most of the modern smart keys require programming by an expert locksmith or dealer. The cost of a replacement fob, programming and mechanical backup keys can increase the total. Check your car's warranty or auto club membership or insurance policy to determine whether they 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 automobile brands. The procedure for certain cars may be slightly different and require special hardware or computer software. In these cases, you should consult the manual or call an authorized dealer for assistance. Before starting, be sure to have all the necessary materials and tools. It is recommended to study the manual for the keyless system to understand how it works. The installation process is fairly straightforward but you'll have to remove the steering wheel cover for access to the wires needed for the connection. Once you have the required wires connected, it is essential to wrap them with electrical tape to ensure protection and insulation. To program an entirely 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 ignition while you hold and press both the unlock and lock button on the new remote for a minimum of 30 seconds. If you do it correctly, your vehicle will chime and the process of programming will be successful. After programming a new keyfob successfully, switch the ignition to “OFF” and test each button to confirm that they work. How do I change the battery in my keyless entry system? Replace the batteries in your keyfob each few years or if you notice that it's less responsive. This is a simple process which can be completed in less than 10 minutes. Most of the time you don't need to change the key fob's programming after replacing the battery. First, you'll need to ensure you have the appropriate type of battery in stock. If you flip the key fob, it should have the name of the battery on it. If it's not, you can use a small flat-head screw driver to unlock the key fob to look inside. Most key fobs accept batteries CR-1620 that are available at numerous stores that include Home Depot, Walmart, & AutoZone. Once you have removed the mechanical key from the key fob you can easily open it using the help of a screwdriver with a flathead or your fingernail. Replace the battery you used with the one you bought. The positive (+) side of the new battery must be facing up. Reassemble the two sides and then snap it to shut. Some key fobs require programming which can be accomplished with a special tool that an automotive locksmith or dealer has access to. However, non-transponder key fobs don't require to be programmed, making them an excellent choice for people who don't have tools needed to program their vehicle.