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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped working abruptly, there are a number of possible causes. These include: an empty coin battery, water damage, receiver module problems and radio interference. Make sure to replace a lost or damaged key with the correct size and type. Also, make sure that the new key is programmed to your vehicle. Dead coin battery A dead battery for your coin is the most common cause of your seat's key fob not working. It's a simple fix that will take only a couple of minutes. The issue could be caused by worn buttons and water damage or interference in the signal, and receiver module issues. These issues can be solved through an OBDII scan, or by reprogramming the 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 position and complete the circuit to send power to the receiver module. The circuit may fail when the clips become loose or damaged by corrosion. To fix the problem, replace the battery with one of the same size, voltage and type. If the key fob has been exposed to water, it is suggested to clean it with a paper towel and isopropyl alcohol. This will prevent further corrosion or damage. You should also allow the electronics to completely dry before replacing the battery. Contacts of the battery may be damaged. The key fob on your Leon is equipped with metal clips that secure the battery and complete the circuit. Contact issues can arise if these clips are not properly tensioned. This can also happen in the event that the battery was replaced with one that's the wrong size or voltage. This can be fixed by replacing the old battery with a brand new one. Make sure to use the same voltage and size as the original. The fob could also stop working if the battery contacts are faulty or there's water damage, signal interference, or a 12 Volt dead battery. In this scenario you'll need to shut off the battery that is 12 volts for a couple of minutes. Reconnect the positive and negative cables afterward. If your Seat Leon keys don't work then you might need to contact a professional auto locksmith. UK Auto Locksmith offers a variety of services for car keys including the reprogramming of key chips. They have low prices and are equipped to handle your car keys repair requirements. Receiver module that is defective The key fob of a seat leon is a tiny device that sends signals to the vehicle. seat key fob of the vehicle may not function if these signals are not received correctly. This could be due to interference from objects, bad conditions in the weather, or transmitters that utilize the same frequency band. The key fob can work within a limited range. Metal clips keep the battery in place inside the key fob. Contact points can fail if they have been worn out, corroded, or corrosion-prone. You can replace the battery in your key fob easily however, you must make sure that it's of the same size and voltage as the original. If your key fob is not functioning properly and it is not working, it could be time to replace the battery or receiver module. This issue can be addressed by a professional at very little cost. They can also reprogram your key fob which will save you money from having to pay a dealership to complete the process for you. A professional can also help you with other issues, for instance the malfunctioning TIPM (transmission immobilizer control unit). They can also install a brand new 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 wide range of interference. This can be caused by satellites or broadcast towers. This kind of interference could also impact the range of your remote. If your remote is working from a limited distance, try placing it next to your chin or head to see if this fixes the problem. In most instances an Leon key fob that has stopped functioning can be easily repaired by resetting the receiver module. This can be done by removing the battery for a couple of minutes (first the negative cable, then the positive cable). Then the key fob should perform as expected. If this does not work, you'll have to visit a dealer licensed to reprogramme. You can also utilize an OBDDII scanner in order to determine the problem. It is possible that the chip inside the key fob has developed a fault that needs to be replaced. This is more likely in the event that the keyfob was exposed salt or water.