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Why Your Seat Leon Replacement Key Won't Work? If you're Seat Leon remote key stopped working abruptly, there are various possible causes. They could be caused by the battery of your coin is dead, water damage, receiver module issues and radio interference. Before replacing a lost key, make sure the replacement key is the right size and type. Also, ensure that the new key has been programmed for your vehicle. Dead coin battery A dead coin battery is the most common reason for your seat leon's key fob not working. This is a simple fix that can be completed in about a minute. However, the problem may also be caused by damaged buttons, water damage or signal interference receiver module issues. These issues can be fixed through an OBDII scan, or by reprogramming the key fob. The coin battery that is inside the key fob is a crucial element of the remote ignition system that is found in your Seat Leon. It is fitted with clips made of metal which keep it in place and also complete the circuit that supplies power to the receiver module. If the clips are loosened or are corroded, it could cause the circuit to fail. To fix the problem change the battery to one of the same size, voltage, and type. If the key fob has been exposed to water it is recommended that you clean it using isopropyl alcohol and paper towel. This will help prevent further corrosion or damage. It is also recommended to allow the electronics to completely dry before replacing the battery. Faulty battery contacts The key fob of your Leon includes metal clips that hold the battery in place and complete the circuit. If they're not properly tightened, it can cause problems with contact. This can also happen when the battery has been replaced with a battery that's the wrong size or voltage. The best solution to remedy this is to replace the old battery with a brand new one. Make sure you choose a battery of the same size and voltage as the original. The fob could also cease to function due to defective battery contacts or signals interference, water damage or a dead 12 volt battery. In this case you'll need to unplug the 12 volt battery for a couple of minutes. Reconnect the positive and negative cables afterward. If your Seat Leon keys don't work it is possible to contact a professional auto locksmith. UK Auto Locksmith can help you with a wide range of key replacement services for cars, including reprogramming the key chip. They offer competitive rates and are highly trained to solve the needs of repairing your car keys. www.g28carkeys.co.uk that is defective The key fob on a seat leon is a small device that transmits signals to the vehicle. If these signals aren't correctly received, the car's immobilizer may not function properly. This can be due to interference from objects, poor weather conditions, or transmitters that operate on the same frequency band. Key fobs can work, but only within a short range. Metal clips hold the battery in inside the key fob. Contact points may fail if they're corroded, worn out or rusted. You can replace the battery on your key fob quickly however you must ensure that it's the exact size and voltage as the original. If your key fob is not running the car, it may be time to replace the battery or the receiver module. A professional can fix the issue at a reasonable cost. You can also modify the key fob yourself and save money by not having to pay a dealer to complete the process. Experts can also assist with other issues such as an issue with your TIPM (transmission-immobilizer control unit). They can also help you replace the ignition switch or sensor. Radio interference The key fob communicates with the car by radio waves, however they can be squelched by a lot of interference. This could be caused by broadcast towers, airplanes, and even satellites. This type of interference could also impact the range of your remote. If your remote is working from a limited distance you can try placing it on your head or chin to see if it fixes the problem. Resetting the receiver module can be enough to repair the issue. Leon keyfob that has stopped functioning. This can be accomplished by removing the battery with 12 volts for a few minutes (first the negative cable followed by the positive cable). The key fob will then be working normally. If not, you may need to visit an authorized dealer to reprogramme the. Alternately, you could employ an OBDII scan tool to determine the cause of the problem. It is possible that the electronic chips inside the key fob have developed an issue and require replacement. This is more likely if the key fob has been exposed to water or salt the water.