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Mazda 2 Key Fob Replacement It can be a bit frustrating when a fob ceases to function. However this is a common problem and is easy to fix. It is usually a simple issue of replacing the batteries. Batteries are available at most big-box retailers and hardware stores. You can also find directions in the 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 feature in your car is a remote-control system that allows you to lock and unlock your vehicle without having to insert your keys. The keyless entry system can be installed on a keyfob, or integrated into the ignition key handle. Certain models allow you to remotely secure the tailgate and trunk. The system operates by transmitting an audio signal from the key fob to your car's computer. The car analyzes the signal to determine whether it is the correct key. If it is it is, the doors will unlock and the engine can be started. The key fob can also contain an integrated security chip to prevent the vehicle from starting if an incorrect key is used. While keyless entry systems are convenient, they come with some disadvantages. Children can accidentally activate them by playing with them, or they could be turned on when the owner isn't in the vehicle. This could cause the power windows and other features to operate without the owner's knowledge or permission and could even cause the car alarm to go off. There are many ways that thieves can hack into the computer of your car to fool it into thinking that your key fob was near enough to enable your car to start. It is vital to have a working fob or backup key. How do I replace my keyless entry system? If your car's key fob battery goes out while you're on road, it could be a huge inconvenience. Fortunately, replacing a Mazda 2 transponder flip key's battery is quite simple. You'll be required to know the proper way to open the key fob, as well as what type of battery you should buy. Make use of a tape-wrapped screwdriver gently pry the case open and work from one side to the other. Be careful not to break it. Once the case is open you can take off the old battery and put the case somewhere where you'll never lose it. Replace the battery, ensuring to orient it so that the positive side faces towards the upwards. It's recommended to note down the code number on the back of your manual key, in order to programme the replacement fob using it. Also note that while you can duplicate an old metal car key at hardware stores, many of the newer smart keys require programming from an expert locksmith or dealer. The cost of a replacement fob, a programming key and a mechanical backup key could add up to the total. Check your car's warranty or auto club membership or insurance policy to determine whether they will cover the expense. You may be able to save money by purchasing an aftermarket fob online and having it programmed by a locksmith rather than the dealership. How do I program my keyless entry system? In general, the same steps are used to programme key fobs for the majority of major car brands. mazda 3 key for some cars may be different and may require specialized hardware or computer software. In such cases it is recommended to refer to the manual or contact an authorized dealer for assistance. Before starting, be sure you have all the materials and tools. 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. The installation is relatively easy but you'll have to remove the steering wheel cover to gain access to the wires needed for the connection. Wrapping the wires in electrical tape will protect and shield them. To program a new key fob, insert the original key into the ignition and then turn it to the “ON” position (not the run or start position). While the key is in the ignition then simultaneously press and hold both the lock and unlock buttons on the new remote for a minimum of 30 minutes. If you do it correctly, your car will chime and the programming process will be successful. After programming a new keyfob successfully, turn the ignition to “OFF” and test all buttons to confirm that they function. How do I change the battery in my keyless entry system? Every few years, or when the key fob is becoming less responsive, you'll need to replace the batteries on your key fob. This can be done in less than 10 minutes. You don't have to reprogram the key fob each time you change the battery. You'll need to ensure you have the correct type of battery in your possession. If you flip the key fob over it, you should see the battery's type written on it. If the battery type is not clear then you can open the key fob with a flat-head screwdriver and check inside. Generally, key fobs accept batteries CR-1620 that are available at many stores, including Home Depot, Walmart, & AutoZone. You can easily access the key fob after you have removed the mechanical key. Use a flathead screwdriver or your fingernail to accomplish this. Replace the old battery with the new one you purchased. The positive (+) side of the new battery must be facing up. Reassemble the two sides and snap it shut. Certain key fobs require programming. This can only be done using a specific tool that is available to locksmiths in the automotive industry or dealers. Non-transponder keys do not require programming, which is why they are a good option for those who do not have the equipment to program their vehicle.