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Mazda 2 Key Fob Replacement While it can be frustrating to see a device stop functioning, it's quite common and easily fixed. It is usually a matter of replacing the batteries. Batteries can be found for replacement at a variety of hardware stores and big-box retailers. You can also look in 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 system? The keyless entry feature in your car is a remote-control system that lets you lock and unlock the vehicle without needing to insert your keys. It is usually contained on a key fob or built into the ignition key handle. Some models offer the option of locking remotely the trunk and tailgate. The system transmits a radio signal to a computer in your car. The car analyzes the signal to determine whether it is the correct key. If it's the correct one the doors will open automatically, and the engine will start. The key fob itself also includes a security chip, or transponder, that stops the car from starting if a incorrect key is used. While keyless entry systems are convenient, they have a few drawbacks. Children can accidentally activate them when playing with them, or they could be turned on while the owner isn't in the vehicle. This can cause the power windows and other features to work without the owner's knowledge or permission and may set off the car alarm. Another reason to be concerned is that there are a myriad of ways for thieves to breach the security of keyless entry systems and even hack the computer of your vehicle to make it think your key fob is near enough to enable the car to start. It is essential to have a spare key or fob. How do battery for mazda 2 key change my keyless entry system? If the battery in your car's key fob dies while you're on the moving, it can be a major inconvenience. Fortunately, changing the Mazda 2 transponder flip key's battery is fairly easy. You will have to know the right method to open the key fob, as well as which type of battery should purchase. Use a screwdriver with tape wrap to gently pry the case open by working from one side to the other. Be careful not to damage it. Once the case has been opened and the battery removed, you can take out the old battery and put the case in a place where you will not lose it. Replace the battery, being sure to orient it so that the positive side faces towards the upwards. You can also program your replacement fob by writing down the code from the back of the manual key. While you can duplicate a key made of metal at a hardware store, most of the modern smart keys require programming by a locksmith or dealer. The cost of buying a new fob, program, and mechanical backup keys can be expensive. If you have an auto club membership or insurance policy, you should check whether it will cover the cost. You could be able to save money by purchasing a key fob from an aftermarket store on the internet, and then having it programmed by a locksmith. How do I program my keyless entry system? In general the same procedure is used to programme key fobs for the majority of major auto brands. The procedure for certain models may be slightly different and may require specialized hardware or computer software. In these instances it is recommended to read the manual or seek out an authorized dealer for further assistance. Before starting, be sure that you have all the required materials and tools. It is recommended that you go through the instruction manual for the keyless system to gain a better understanding of how it works. Installation is relatively simple, but you will need to remove the cover of your steering wheel for access to the wires required for the connection. Once you have the required wires in place, it's crucial to wrap them in electrical tape to protect them and provide insulation. To program your new key fob insert the original key into the ignition and turn it to the “ON” position (not the run or start position). While the key in the ignition is turned on simultaneously press and hold both the unlock and the lock button of the new remote for 30 minutes. If done correctly, your vehicle will sound a chime, and the process of programming will be successful. After programming the new keyfob successfully turn the ignition to “OFF” and test each button to confirm that they work. How do I replace the battery in my keyless entry system Replace the batteries in your keyfob each few years or if you notice it's less responsive. This is an easy task that can be completed in about 10 seconds. You don't have to reprogram the key fob every time you change the battery. The first step is to ensure that 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 type isn't legible it is possible to open the key fob using a flat-head screwdriver to check inside. Most key fobs accept CR-1620 batteries that are readily available at many stores including Home Depot, Walmart, & AutoZone. You can easily open the key fob by you have removed the mechanical key. Use a screwdriver with a flat head or your fingernail in order to do this. Then, take out the old battery and replace it with the new one that you previously purchased. Make sure that the new battery has its positive (+) side facing up and then reassemble both sides of the key fob, and snap to close it. 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. But, non-transponder steel keys don't require to be programmed, making them an excellent choice for those who don't have tools needed to program their vehicle.