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Mazda 2 Key Fob Replacement It can be a bit frustrating when a fob ceases to function. However it is a common problem and is easy to fix. It is usually a simple issue of replacing the batteries. Batteries can be found in many big-box retailers as well as hardware stores. You can also find directions 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 feature in your car is a remote control system that lets you lock and unlock the vehicle without the need to insert your keys. It is typically contained on a key fob or built into your ignition key handle. Some models also offer the option of remotely locking the tailgate and trunk. The system transmits an audio signal to the computer in your car. The car analyzes the signal to determine whether it is the correct key. If it's a valid key then the doors will be opened automatically and the engine can begin. The key fob is also equipped with a transponder or integrated security chip that prevents the vehicle from starting if a faulty key is used. G28CarKeys come with advantages and drawbacks. Children can accidentally activate them when playing with them, or they can be turned on when the owner isn't in the vehicle. This could cause the power windows and other features to function without the knowledge or consent of the owner and may trigger the car alarm. Another reason to be concerned is that there are a multitude of ways that thieves could breach the security of keyless entry systems and even hack the computer of your vehicle to make it believe your key fob is close enough to enable the car to start. It is crucial to always have a working spare key or fob. What can I do to change my keyless access control system? If your car's key fob battery fails while you're road, it could be a major problem. Fortunately, replacing a Mazda 2 transponder flip key's battery is relatively simple. You'll need to know how to open the key fob and which type of battery to purchase. Make use of a tape-wrapped screwdriver gently pry open the case and work from one side to the other. Be careful not to damage it. Once the case has been opened, remove the previous battery. Place the case somewhere so that it is not forgotten. Replace the battery, turning it to ensure that its positive side is facing upwards. You can also program the replacement fob by writing down the code number on the back of the manual key. Note that while you can duplicate an old car key made of metal at hardware stores, many modern smart keys require programming from a locksmith or dealer. The cost of replacing a fob, a programming key and mechanical keys for backup can add to the total. Check your warranty on your car, auto club membership, or insurance policy to see whether they cover the expense. You might be able save money by purchasing an aftermarket fob on the internet and having it programmed by a locksmith rather than a dealership. How do I program my keyless entry system? In general, the same procedure can be used to program a key fob for all major car models. The process for certain vehicles may be different and require special hardware or computer software. In such cases it is best to refer to the manual or seek out an authorized dealer for more assistance. Before starting, be sure that you have all of the required materials and tools. It is recommended that you read the instructions for the keyless system to better understand how it works. Installation is simple, but the cover for the steering wheel needs to be removed to get access to the wires needed for the connection. Once you have all the wires in place, it's important to wrap them with electrical tape for protection and insulation. To program a key fob for a new car, insert the ignition key from the previous vehicle and turn it to the “ON” setting (not the “start” or “run”) When the key is in the ignition you must simultaneously press and hold both the lock and unlock buttons on your new remote for at least 30 minutes. If you have done it correctly the vehicle will chime. The programming process is also 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 each few years or whenever you notice that it is less responsive. This task can be accomplished in less than 10 minutes. Most times you won't even have to reprogram your key fob after replacing the battery. First, you'll need to ensure you have the appropriate type of battery on hand. If you flip the key fob it, you should see the name of the battery on it. If the type of battery is not visible you can remove the key fob with a flat-head screwdriver to check inside. Most key fobs accept batteries of CR-1620, which are readily available at many stores such as Home Depot, Walmart, & AutoZone. You can easily access the key fob after taking out the mechanical key. Use a screwdriver with a flat head or your fingernail in order to do this. Replace the old battery with the one you purchased. The positive (+) side of the new battery must be facing upwards. Reassemble the two sides and snap it to shut. Some key fobs need programming. This can only be done with a special tool, which is only available to automotive locksmiths or dealers. Non-transponder keys don't require programming, which is why they can be a viable option for those without the tools to program their car.