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Mazda 2 Key Fob Replacement Although it can be a bit frustrating to find a fob that stops working, it is fairly common and easily repaired. Most of the time, it's just a a matter of replacing the battery. You can find replacement batteries at the majority of hardware stores and big-box retailers. 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 entry system? The keyless entry system that is in your car is a remote control system that allows you to lock and unlock your car without physically inserting the keys. It's usually on a key fob, or built into your ignition key handle. Some models even provide the option of locking remotely the trunk and tailgate. The system works by transmitting an radio signal from the key fob to your car's computer. The car analyzes the radio signal to determine if it is the correct key. If it is then, the doors will unlock and the engine will be started. The key fob in itself comes with a security chip, also known as a transponder, that stops the car from starting if the wrong key is used. While keyless entry systems are convenient, they have some disadvantages. They are prone to being accidentally activated by children playing with them or switched on when the owner isn't there in the car. This can cause power windows and other features of the car to operate without the owner’s consent or knowledge and could even trigger the alarm. Another issue is that there are a myriad of ways thieves could break the security of keyless entry systems, and then hack the computer in your vehicle to make it believe your key fob is near enough to allow you to start your car. It is important to always have a working fob or backup key. How do I change my keyless entry system? It could be a huge problem if your key fob battery fails while you are on the road. Fortunately, replacing a Mazda 2 transponder flip key's battery is relatively simple. You'll just need to know how to open the key fob, and then which type of battery to purchase. 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 has been opened, remove the previous battery. Place the case in a place so that it is not forgotten. Replace mazda demio key g28carkeys.co.uk , turning it to ensure that its positive face is facing up. It's recommended to note the code number on the back of your manual key so that you can program the replacement fob using it. Be aware that although you can duplicate an old car key made of metal at hardware stores, a lot of the most recent smart keys require programming from an expert locksmith or dealer. The cost of replacing a fob, programming or a mechanical backup key could be added to the total. If you have an auto club membership or insurance policy, make sure to see if it can pay for the cost. You could be able 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 program key fobs on most major automobile brands. The process for certain vehicles might be different and may require specialized hardware or computer software. In these instances you should refer to the manual or contact an expert for more assistance. Be sure to have the tools and materials you require prior to starting. It is recommended to study the manual for the keyless system in order to better understand how it works. The installation is relatively easy however, you'll need to remove the steering wheel cover in order to access the wires required for the connection. Once you have the wires in place, it's important to wrap them with electrical tape to protect them and for insulation. To program an entirely new key fob insert the original key into the ignition and then turn it to the “ON” position (not the start or run position). When the key in your ignition is switched on, simultaneously press and hold both the unlock and the lock button of the new remote for 30 minutes. If you have done it right the vehicle will chime. The programming process is also successful. After successfully programming a new key fob, return the ignition to the “OFF” position and test all buttons to make sure they work properly. How do I replace the battery in my keyless entry system? Replace the batteries in your keyfob every couple of years or whenever you notice that it's less responsive. This can be done within less than 10 seconds. Most of the time you don't have to reset your key fob after replacing the battery. It is essential to have the correct battery in your inventory. If you flip the key fob it should show the battery's name written on it. If it is illegible, you can use a small flat head screw driver to open the key fob and examine inside. Key fobs usually accept the CR-1620 batteries, which are readily available at many shops, including Home Depot Walmart & AutoZone. It is easy to open the key fob by taking out the mechanical key. Use a flathead screwdriver or your fingernail to do this. Then, remove the old battery and replace it with the new one you purchased previously. The positive (+) side of the new battery should be facing upwards. Reassemble the two sides and then snap it shut. Certain key fobs require programming that can only be accomplished with a special tool that an automotive locksmith or dealer has access to. However, non-transponder keys are not required to be programmed, making them a great choice for those who don't have tools to program their car.