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Mazda 2 Key Fob Replacement Although it can be a hassle to find a fob that stops working, it's fairly frequent and easily fixed. Usually, it is just an issue of replacing the battery. Batteries can be found in many big-box retailers as well as hardware stores. You can also find instructions in your 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 system you have in your car is a remote control system that enables you to lock and unlock your car without physically inserting the keys. It is usually contained on the key fob or integrated into your ignition key handle. Some models also offer the option of locking remotely the tailgate and trunk. The system works by sending an audio signal from the key fob to the car's computer. The car then interprets the radio signal to determine if it is the right key. If it's the correct key the doors will open automatically and the engine will begin. The key fob is also equipped with an embedded security chip to prevent the vehicle from starting if a wrong key is used. While keyless entry systems are convenient, they have a few drawbacks. They can be accidentally activated by children playing with them or activated when the owner isn't in the vehicle. This could cause the power windows and other features to operate without the knowledge or consent of the owner or permission, and it could trigger the car alarm. There are numerous ways that thieves can 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 vital to have a fob or backup key. How do I replace my keyless access device? It could be a huge inconvenience if your key fob's battery fails while you're on the road. It's easy to replace the battery on a Mazda 2 flip key transponder. mazda car keys replacement G28 Car Keys Solutions 'll need to know how to open the key fob and which type of battery to purchase. You'll need an flathead screwdriver wrapped in tape to pry open the case, starting from one side, and then the other side, working slowly to avoid damaging it. After the case is removed, you can remove the old battery. Place the case in a place so that you don't forget it. Replace the battery, orienting it so that its positive side is facing upwards. You can also program your replacement fob by writing down the code number on the back of the manual key. While you can duplicate a key made of metal in a hardware store, most of the modern smart keys require programming by a locksmith or dealer. The cost of a replacement fob, a programming key and mechanical keys for backup can add up to the total. Make sure to check your warranty or auto club membership or insurance policy to determine whether they'll cover the expense. You could save money by purchasing a second-hand key fob on the internet, and having it programmed instead by locksmith. How do I set up a keyless entry system to my home? In general the same steps are used to programme key fobs for the majority of major car brands. The procedure for certain cars may be different and require special hardware or computer software. In these cases you should refer to the manual or talk to an expert for more assistance. Be sure to have the tools and materials you need prior to beginning. It is recommended to also go through the instruction manual for the keyless entry system to get an understanding of how it works. Installation is simple, but the steering wheel cover must be removed in order to reach the wires needed for the connection. Wrapping the wires with electrical tape will shield and insulate 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). When the key is in the ignition then simultaneously press and hold both the unlock and lock button on the new remote for at least 30 seconds. If you do it correctly, your car will sound a bell and the process of programming will be successful. After successfully programming the new key fob, switch the ignition back to the “OFF” position and test all of the buttons to make sure they function properly. How do I change the battery on my keyless entry system? Replace the batteries in your keyfob every couple of years or when you notice that it's less responsive. This task can be accomplished within less than 10 seconds. You don't have to reprogram the key fob every time you change the battery. In the beginning, you'll want make sure you have correct type of battery in your inventory. The type of battery should be written on the key fob, if you flip it over. If it's unclear then you can use a small flat-head screw driver to open the key fob to look inside. Most key fobs accept batteries of CR-1620, which are readily available at many stores that include Home Depot, Walmart, & AutoZone. It is easy to access the key fob after you have removed the mechanical key. Use a flathead screwdriver or your fingernail for this. Replace the old battery with the one that you purchased. Make sure the new battery has its positive (+) side facing up and then reassemble the two sides of the key fob, and snap them to seal it. 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. However, non-transponder keys are not required to be programmed, making them a great option for those who don't have the tools to program their car.