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Mazda 2 Key Fob Replacement Although it can be a hassle to find a fob that stops working, it's frequent and easily fixed. It is usually a changing the battery. Batteries can be found for replacement in a wide range of hardware stores as well as big-box retailers. You can also find the instructions in your owner's guide 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 vehicle is a remote control system that lets you to lock and unlock your vehicle without physically inserting the keys. The keyless entry system can be found on a keyfob or integrated into the ignition key handle. Some models let you choose to remotely secure the tailgate and trunk. The system transmits an audio signal to the computer in your car. mazda key fob analyzes the signal to determine if it's the correct key. If it's a valid key it will unlock the doors automatically and the engine can begin. The key fob itself also has a security chip, also known as a transponder, that prevents the car from starting if a wrong key is used. While keyless entry systems are convenient, they do have some disadvantages. Children can accidentally activate them through playing with them, or they can be turned on when the owner isn't in the vehicle. This could cause the power windows as well as other features to be in operation without the knowledge or consent of the owner, and it may even cause the car alarm to go off. There are numerous ways that thieves could hack into the computer in your car to fool it into thinking your fob's key was close enough to be able to start your vehicle. It is therefore crucial to make sure that you always have a spare fob or key. How do I replace my keyless entry system? It can be a major issue if the key fob battery is damaged while you're on the road. It's simple to change the battery on the Mazda 2 flip key transponder. You'll just need to know how to open the key fob and which kind of battery to purchase. You'll want to use a flathead screwdriver that is tape wrapped to open the case. Start with the one side and moving to the other side, using it gently so as to prevent breaking it. Once the case has been opened, take out the old battery. Place the case somewhere that you will not forget about it. Replace the battery, but be sure to align it so that the positive side faces upwards. 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 at a hardware store, many of the newer smart keys require programming by a locksmith or dealer. The cost of replacing a fob, programming or a mechanical back-up key can be added to the total. If you have an auto club membership or insurance policy to see if it will cover the cost. You might be able to save some money by getting an aftermarket fob online and having it programmed by a locksmith, instead of the dealership. How do I program a keyless entry system for my home? In general the same steps are used to program key fobs for most major auto brands. The procedure for certain cars might be different and may require specialized hardware or computer software. In these instances, you should consult the manual or talk to an expert for more assistance. Be sure to have the tools and materials that you need prior to beginning. It is recommended to go through the instruction manual for the keyless system to better understand how it works. Installation is fairly easy however, the cover of the steering wheel must be removed to expose the wires that will be used to connect. Wrapping the wires with electrical tape will protect and keep them in place. To program a key fob to a new vehicle, insert the ignition key from the previous vehicle and turn it on to the “ON” setting (not the “start” or “run”) While the key in the ignition is on, simultaneously press and hold both the unlock and the lock button on your new remote for 30 minutes. If you do it correctly, the car will sound a bell and the process of programming will be successful. After programming a new keyfob successfully, turn the ignition to “OFF” and test all buttons to ensure that they function. How do I change the battery on my keyless entry system? Replace the batteries on your keyfob at least every couple of years or when you notice it's less responsive. This is an easy task that can be completed within a matter of 10 seconds. You don't need to reprogramme the key fob each time you replace the battery. You'll need have the correct type of battery in your arsenal. The battery's type should be written on the key fob when you flip it over. If the battery's type is not visible, you can open the key fob with a flat-head screwdriver to check inside. Key fobs generally accept CR-1620 batteries that are readily available at many stores including Home Depot, Walmart, & AutoZone. After you've 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. Then, take out the battery that was in use, and replace it with the new one you purchased previously. Make sure the new battery has its positive (+) side facing up Then, reassemble the two sides of the key fob and snap it to close. Certain keys require programming which can be done with a specific tool that an automotive locksmith or dealer has access to. Non-transponder keys don't require programming, therefore they are a great option for those who do not have the equipment to program their vehicle.