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Mazda 2 Key Fob Replacement While it is frustrating to find a fob that stops working, it's common and can be easily fixed. It is usually a simple issue of replacing the batteries. Batteries are available at most big-box retailers and hardware stores. You can also look in the owner's manual or 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 allows you to lock and unlock the vehicle without the need to insert your keys. The keyless entry system is typically installed on a keyfob, or integrated into the ignition key handle. Some models also offer the option of remotely locking the trunk and tailgate. The system transmits an audio signal to the computer in your car. The car is then able to determine whether it is the correct key. If it's the right key it will unlock the doors instantly and the engine can begin. The key fob also has a transponder or integrated security chip that blocks the vehicle from starting if a faulty key is used. While keyless entry systems are convenient, they have some drawbacks. Children can accidentally activate them when playing with them, or they may be turned on when the owner is not in the vehicle. This could cause the power windows and other features to function without the owner's knowledge or permission and may set off the car alarm. Another reason to be concerned is that there are a multitude of ways thieves could break the security of keyless entry systems and hacked into the computer system of your vehicle, making it believe that your key fob is near enough to start the car. It is crucial to always have a working backup key or fob. How do I change my keyless entry system? If your car's key fob battery fails while you're move, it can be a major problem. Fortunately, changing a Mazda 2 transponder flip key's battery is fairly easy. You'll only need to know how to open the key fob and what kind of battery to purchase. Use a tape-wrapped screwdriver to gently pry the case open, working from one side to the other. Be careful not to damage it. After the case is opened, remove the old battery. Place the case somewhere so that you don't forget it. Replace the battery, ensuring to place it in a way that the positive side is facing upwards. It's also a good idea to note the code number on the reverse of your manual key so that you can programme the replacement fob using it. Note that while you can copy an old car key at hardware stores, a lot of the most recent smart keys require programming from an expert locksmith or dealer. The cost of a brand new fob, a new programming device, and mechanical backup keys can add up. If you have an auto club membership or insurance policy, you should check to see if it will pay for the cost. You might be able to save money by buying a replacement key fob online, and having it programmed by a locksmith. How do I program my keyless entry system? In general the same procedure is used to program key fobs for most major automobile brands. However, the process for certain vehicles might differ and may require specialized hardware or software. In these instances you should refer to the manual or contact an authorized dealer for assistance. Be sure to have the equipment and materials you need prior to beginning. It is recommended that you go through the instruction manual for the keyless entry system in order to get an understanding of the way it works. Installation is relatively simple but you'll have to take off the cover for the steering wheel to access the wires needed for the connection. Wrapping the wires with electrical tape will shield and shield them. To program a key fob on a new vehicle, simply insert the original ignition key and turn it to the “ON” setting (not the “start” or “run”) When the key is in ignition you must simultaneously press and hold both the unlock and lock button on your new remote for a minimum of 30 seconds. If you've done it right, your 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 of the buttons to make sure they work correctly. How do I change the battery in my keyless entry system? Every few years or when the key fob becomes less responsive, you'll have to replace the batteries on your key fob. This is a simple job that can be done within a matter of 10 seconds. You don't have to reprogram the key fob every time you replace the battery. The first step is to make sure you have the correct type of battery in stock. The type of battery should be written on the key fob in case you flip it over. If the type of battery isn't legible it is possible to open the key fob with an flat-head screwdriver and look inside. Key fobs typically accept the CR-1620 battery, which is widely available in a variety of shops, including Home Depot Walmart & AutoZone. After you've removed the mechanical key from the key fob, you can easily open it by making use of a screwdriver with a flathead or your fingernail. Replace mazda 2 car key used with the one you bought. The positive (+) side of the new battery should be facing upwards. Reassemble the two sides and snap it to shut. Certain keys require programming and can only be done with a specific tool that an automotive locksmith or dealer has access to. But, non-transponder steel keys do not need to be programmed, making them a great option for those who don't have the tools to program their car.