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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped suddenly, there could be many possible reasons. These include an empty coin battery, water damage, receiver module issues, and radio interference. Make sure you replace a lost key with the correct size and type. Also, make sure that the new key is programmed to your vehicle. Dead coin battery The most common reason for your seat leon key fob not working is a dead coin battery. It's a simple fix that can be completed in a couple of minutes. However, the problem may be caused by damaged buttons, worn buttons or signal interference receiver module problems. These issues can be fixed with an OBDII scan or by reprogramming your key fob. The coin battery inside the key fob is a vital element of the remote ignition system of 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. The circuit may fail when the clips are loose or damaged by corrosion. Replace the battery with a brand new one of the same kind, voltage, and size to correct the problem. If the key fob was exposed to water, it is suggested to clean it with a paper towel and isopropyl alcohol. This will help avoid further damage or corrosion. You should also allow the electronics to dry completely 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. Contact issues can arise if these clips are not properly tensioned. This can also happen if you replace the battery with the wrong voltage or dimensions. This can be fixed by replacing the old battery with a new one. Choose a battery of the same size and voltage as the original. The fob can be inoperable if contacts to the battery are defective or there's water damage, there is signal interference or a 12- voltage dead battery. In this case, disconnect the 12 Volt batteries for a few moments. After that, reconnect the negative and positive cables. If your Seat Leon keys don't work and you are unable to use them, it's best to contact an auto locksmith professional. navigate to this website offers a range of car key services including the reprogramming of key chips. They have reasonable rates and are skilled to handle your car keys repair needs. A malfunctioning receiver module The key fob of the seat Leon is a tiny device that sends signals to your vehicle. If these signals aren't correctly received, the car's immobilizer system could stop working. This could be due to interference from objects, poor weather conditions, or transmitters on the same frequency band. The key fob might still work but only within the limits of a small range. The battery in the key fob is held in place by clips made of metal. If these are corroded or worn out, the contact points can fail. You can replace the battery in your key fob in a snap, but you must ensure that it's the same size and voltage as the original. If your key fob is not functioning properly it might be time to replace the battery or receiver module. This issue can be addressed by a professional for an affordable cost. They can also reprogram your key fob which will save you money from having to pay a dealership to perform the task for you. A professional can also assist you with other issues, such as an issue with your TIPM (transmission immobilizer control unit). They can also install a new ignition switch or sensor. Radio interference The key fob communicates with the car by radio waves, however these can be scrambled due to a large amount of interference. This can be due to broadcast towers, airplanes, and even satellites. This kind of interference could also affect the range of your remote. If your remote is only working from a narrow range Try placing it close to your head or chin and try to determine if this resolves the problem. In the majority of instances an Leon key fob that has stopped functioning can be easily repaired by resetting the receiver module. This can be accomplished by taking out the battery with 12 volts for a few minutes (first the negative cable followed by the positive cable). After that the key fob will work as normal. If not, you'll require a visit to an authorized dealer for reprogramming. You can also use an OBDDII scanner in order to determine the problem. It is possible that the electronic chips in the key fob have developed an issue and require replacement. This is more likely when the key fob has been exposed to salt or water.