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Why Your Seat Leon Replacement Key Won't Work? Seat Leon remote keys that suddenly stop working can be caused by a variety. seat arona key could be due to a dead coin battery water damage, problems with the receiver module and radio interference. If you are replacing a key that has been lost ensure that the replacement is the correct size and type. Also, make sure that the new key is programmed for your vehicle. Dead coin battery The most frequent reason for your seat leon key fob not working is a dead battery. It is a simple fix that should only take about a minute. However, the issue could be caused by damaged buttons, water damage or signal interference, as well as receiver module problems. These issues can be fixed with an OBDII scanner or reprogramming your key fob. The coin battery in the key fob of your Seat Leon is a very vital component of the remote keyless system. It is made of metal and has clips which keep it in place and also complete the circuit by sending power to the receiver module. If the clips are damaged or corroded, it could cause the circuit fail. Replace the battery with one with the same type in size, voltage, and type to fix the problem. If the key fob has been exposed to water, it is suggested to wipe it clean using a paper towel and isopropyl alcohol. This will help prevent further corrosion and damage. You should also allow the electronics to dry completely before replacing the battery. Contacts to the battery are not working properly. The key fob of your Leon has metal clips that secure the battery and complete the circuit. If these aren't properly tensioned this can lead to contact issues. This can happen even when the battery has been replaced with a unit that's the wrong size or voltage. The best solution to remedy this is to replace the old battery with a fresh one. Choose a battery of exactly the same size and voltage as the original. The fob could also stop working if the battery contacts are faulty, there is water damage, there is signal interference, or a 12 volt dead battery. In this scenario, you must disconnect the 12 voltage batteries for a couple of moments. Reconnect the positive and negative cables afterward. If your Seat Leon keys aren't working, it may be the time to speak with a specialist auto locksmith. UK Auto Locksmith can help you with a wide range of services for your car keys including reprogramming of the key chip. They provide competitive rates and are well-trained to solve your car key repair needs. The receiver module is not working properly. The key fob of the seat Leon is a small device that transmits signals to your car. If the signals aren't properly received, the vehicle's immobilizer may not function properly. This can be due to interference from objects, bad weather conditions, or transmitters that operate on the same frequency band. The key fob might still work but only within an extremely short distance. Metal clips hold the battery in place in the key fob. If they get corroded or worn out the contact points may fail. You can easily replace the battery in your key fob, but make sure it's of the same size and voltage. If your key fob is not starting the car and it is not working, it could be time to replace the battery or receiver module. A professional can fix the issue at a reasonable cost. They can also reprogram your key fob which will save you money by not having to pay a dealership to help you. Professionals can also assist with other issues like a malfunctioning TIPM (transmission-immobilizer control unit). They can also fix the ignition switch or sensor. Radio interference The key fob communicates with the car via radio waves, but they are susceptible to being snuffed out by a variety of interference. This can happen from broadcast towers, airplanes, and even satellites. This kind of interference can also affect the range your key is able to reach. If your remote key is only working from a narrow range put it on your chin or forehead and try to determine if this resolves the problem. Resetting the receiver module is typically enough to repair the issue. Leon keyfob that has stopped working. This can be done by taking the battery off for a couple of minutes (first then, the negative cable, then the positive cable). After that the key fob should perform as expected. If it doesn't work, you'll need to see a dealer authorized to reprogramme your. You can also use an OBDDII scanner to diagnose the problem. It is possible that the electronic chip within the key fob has developed a fault that will require replacement. This is especially true if the key fob has been exposed to salt or waters.