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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 of causes. Some of these include: dead batteries or water damage to the receiver module, radio interference and damaged coin batteries. Make sure to replace a lost or damaged key with the correct type and size. Also, ensure that replacement seat car key is programmed to your vehicle. Dead coin battery A dead coin battery is the most frequent cause of your seat leon's key fob not working. It's a simple fix that should only take just a few minutes. However, the problem may also be caused by damaged buttons, water damage or signal interference receiver module problems. These issues can be fixed by using an OBDII scanner, or by reprogramming the key fob. The coin battery inside the key fob is an important element of the remote ignition system that is found in your Seat Leon. It is equipped with metal clips that hold it in place and complete the circuit by sending power to the receiver module. The circuit can fail when the clips are loose, or corroded. 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 recommended to clean it with isopropylethanol and paper towel. This will prevent further damage or corrosion. It is essential to allow the electronics to completely dry before replacing the battery. Contacts for the battery that are defective The key fob on your Leon comes with metal clips that bind the battery and complete the circuit. If these clips aren't properly tensioned it could result in contact issues. This is also common when the battery was replaced with one that's wrong size or voltage. The best method for fixing this issue is to replace the old battery with a brand new one. Make sure you use a battery of the same voltage and size 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 Volt dead battery. In this instance, disconnect the 12 voltage batteries for a couple of seconds. Reconnect the positive and negative cables following. If your Seat Leon keys don't work then you might need to call an auto locksmith professional. UK Auto Locksmith can help you with a range of services for your car keys including reprogramming of the key chip. They offer competitive prices and are highly trained to deal with the needs of repairing your car keys. Receiver module that is defective The key fob for the seat leon is a tiny device that sends signals to your vehicle. The immobilizer mechanism of the car can stop working if these signals are not received correctly. This could be because of interference from objects, poor weather conditions, or transmitters on the same frequency band. The key fob might operate within a specific range. Metal clips keep the battery in place in the key fob. If these are corroded or worn out the contact points might fail. You can replace the battery on your key fob in a snap however, you must make sure that it's the same size and voltage as the original. If your key fob isn't functioning properly and it is not working, it could be time to replace the battery or the receiver module. A professional can repair this issue at a minimal cost. They can also reprogram your key fob, which will save you money from needing to pay a dealer to perform the task for you. A professional can also help you with other issues, such as a faulty 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 by radio waves, but these can be scrambled by a lot of interference. This could be caused by broadcast towers, airplanes, and even satellites. This kind of interference could also impact the range of your remote. If your remote key is working from a limited distance, try placing it on your head or chin to see if it fixes the problem. In most instances, a Leon key fob that has stopped functioning can be easily repaired by resetting the receiver module. This can be accomplished by taking out the 12 volt battery for a few minutes (first the negative cable, then the positive cable). The key fob should then work normally. If this doesn't work, you'll have to visit a dealer authorized for reprogramming. You can also employ an OBDDII scanner in order to determine the problem. It's possible that the electronic chips in the key fob have developed faults and require replacement. This is more likely when the keyfob is exposed to water or salt.