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Mazda 2 Key Fob Replacement Although it can be a hassle to have a fob stop working, it's fairly frequent and easily fixed. In most cases, it's a replacement of the battery. Batteries can be found at many big-box retailers as well as hardware stores. There are also instructions in the owner's manual or on YouTube on how to replace the battery by opening the fob. What is a keyless system? The keyless entry system in your car is a remote-control system that allows you to lock and unlock the vehicle without having to insert your keys. The keyless entry system can be installed 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 a radio signal to the computer in your car. mazda replacement keys interprets the radio signal to determine if it's the correct key. If it is, the doors will automatically unlock and the engine will be started. The key fob is also equipped with an embedded security chip that blocks the vehicle from starting if the wrong key is used. Keyless entry systems come with advantages and disadvantages. Children can accidentally activate them by playing with them, or they can be turned on when the owner is not in the vehicle. This can cause power windows and other features of the car to function without the owner's consent or knowledge, and may even trigger the alarm. There are also a number ways for thieves to hack into the computer of your car to fool it into thinking your key fob was close enough to start your car. It is crucial to always have a backup key or fob. How do I replace my keyless entry system? If the battery in your car's key fob goes out while you're on go, that can be a major problem. It's easy to change the battery on a Mazda 2 flip key transponder. You'll only need to know how to open the key fob and which type of battery to purchase. You'll want to use an flathead screwdriver wrapped in tape to pry open the case. Begin with the one side and moving to the other side, using it gently to avoid damaging it. Once the case has been opened and the battery removed, you can take out the battery from the case and place the case somewhere you won't lose it. Replace the battery, placing it so that the positive side is facing up. It's recommended to note the code number on the back of your manual key, to allow you to program the replacement fob by using it. While you can duplicate an old metal key at 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 a mechanical backup key could add up to the total. If you have an auto club membership or insurance policy, make sure whether it will pay for the cost. You could be able to save money by buying a replacement key fob online, and having it programmed by locksmith. How do I program my keyless entry system? Generally, the same steps can be used to program a key fob for most major car models. The procedure for certain cars might be different and may require specialized hardware or computer software. In these cases you should refer to the manual or call an authorized dealer for assistance. Before starting, make sure you have all the materials and tools. It is also recommended to go through the instruction manual for the keyless entry system in order to gain a better understanding of how it works. The installation is relatively easy but you'll have to remove the cover of your steering wheel in order to access the wires necessary for the connection. Wrapping the wires in electrical tape will shield and insulate them. 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). When the key is in ignition then simultaneously press and hold both the lock and unlock buttons on the new remote for a minimum of 30 seconds. If you've completed the procedure correctly your car will sound a chime. The programming process will also be successful. After programming a new keyfob successfully, switch the ignition to “OFF” and test all buttons to confirm that they work. How do I change the battery on my keyless entry system? Every few years or when the key fob is becoming less responsive, you'll have to replace the batteries in your key fob. This can be done in under 10 minutes. Most times you won't even have to modify your key fob's settings after replacing the battery. It is essential to have the right battery in your possession. If you flip the key fob over it should show the name of the battery on it. If the type of battery isn't legible it is possible to open the key fob with an screwdriver with a flat head and examine inside. Key fobs usually use CR-1620 battery, which is easily available at a variety of stores like Home Depot Walmart & AutoZone. You can easily open the key fob by removing the mechanical key. Use a screwdriver that is flat or your fingernail in order to do this. Remove the old battery, and replace it with the one you purchased previously. Make sure the new battery has its positive (+) side facing upwards and then reassemble both sides of the key fob, and snap it shut. Some key fobs need programming. This can be done with a special tool that is only accessible to automotive locksmiths or dealers. Keys that are not transponder-compatible do not require programming, which is why they are a good choice for those who don't have the tools to program their car.