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Seat Leon Key Fob Replacement It may not be required to replace or reprogramme your seat leon remote fob if it stopped working. You must first examine the battery. You can pry the battery from many fobs using a small gap or switch. Use the same type of battery as the original. Dead coin battery A battery that is dead is among the most common causes for a key fob to stop working. It is easy to replace and only takes some minutes. However, you should first make sure you are using the correct kind of battery. Most key fobs use CR2032 3V batteries, which can be found at most electronics stores as well as online. The owner's manual or YouTube video should provide instructions on opening the key fob and re-installing its battery. The KeyLab if the Leon key fob has an impervious coating, prolonged exposure to saltwater may damage the electronic chip in the remote. In certain cases, this may also stop the key fob from communicating with your vehicle. You will need to clean it with isopropyl or an electronic cleaner, and dry it before placing the battery back. If you don't think the battery is the issue the buttons may have become misaligned from constant use. A careful visual inspection will identify if they're loose or damaged and should be soldered back in place. You can do this yourself, or you can take the key fob to an auto shop to have it repaired. You may have to replace the remote based on the severity. Contacts to the battery are not working properly. One of the most common reasons for a key fob to stop functioning is due to defective battery contacts. This could be due to dirt or water in the case for the key fob or wear and tear over time. The solution is to clean the battery contacts with isopropyl alcohol. This will restore communication between the microprocessor, battery, and the key fob. You can change the battery inside your Leon key fob by opening the two halves with a small screwdriver with a flat blade and then removing the battery. You can purchase a new battery from any electronics store. Be sure to follow the instructions in the user's manual of your device when taking off and installing the new battery. You could also try resetting the remote keyless system using the battery that is 12 volts for a short period of time. This will reset all on-board computers and may help to restore the capability of your key fob to connect with your car. If the problem persists you should speak to your dealer to reprogram your keys. They will utilize an OBDII scanner to diagnose the problem and may be capable of reprogramming your key fob, without the need for another key. This procedure is typically completed in less than an hour. The dealer can reset the immobilizer. Water damage It's essential to act immediately if your key fob has been submerged in water. Water and electronics aren't an ideal mix and could cause damage to the circuit board. A key fob that is wet will also cease to function. This is why it is important to repair the issue as soon as you are able to. If you've accidentally dropped your key fob in the water or puddle or even thrown it into the wash accidentally the first thing you need to do is remove the battery and allow it to dry completely. You can also use a paper towel or tissue to dry the outer casing. You can also place it in a bag that is filled with silica gel bags to aid in the absorption of water. Once your key fob's completely dry, it's the time to start putting it back together. Make sure the battery is securely inserted and that the metal contacts on the circuit board are clean. You can try a small amount of isopropyl ethanol to clean these areas if necessary. You should be able to start your car with the key fob after all this. If it's not working it could be necessary to address other problems. It could be due to a broken key or a transponder that needs to be reprogrammed. The receiver module is not working properly. It's time to replace the receiver module if you tried everything, such as replacing the batteries, reprogramming or using an extra key fob. This is an electronic component that sends signals to other components on the car like the immobilizer. Without a working receiver module, the security system of your car won't function, and you won't be able start your car. If the receiver unit in your seat leon is damaged or doesn't transmit the correct radio frequency signals you'll see an error code on the instrument panel. In many instances, the issue will be resolved by connecting an OBDII scanner to the vehicle's diagnostic port and examining it for issues. Then you can reprogramme the key using a dealer-supplied programmer and check if that resolves your problem. Key fobs are subjected to many abuses, which is why they're not impervious to destruction. The battery terminal contacts as well as the button are the most common failure points. These are easy to repair and replace with little effort. If the key fob batteries in your car aren't functioning properly test the voltage using the aid of a voltage meter. If the battery is showing less than 3 Volts, it is time to replace it. You can get the replacement battery in any auto parts store or electronics center.