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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped working suddenly, there are various possible causes. These include a dead coin battery, water damage, receiver module issues, and radio interference. Make sure to replace a lost key using the correct type and size. Also, make sure that the new key is programmed for your vehicle. Dead coin battery The most frequent reason for your seatleon key fob not working is a dead battery. This is a straightforward fix that should only take about a minute. However, the issue could be caused by damaged buttons, worn buttons or signal interference, as well as receiver module problems. These issues can be fixed with an OBDII scan tool or by reprogramming the key fob. The battery inside the key fob is an important element of the remote ignition system of your Seat Leon. It is held in place by steel clips. These clips complete the circuit, and supply energy to the receiver module. The circuit can fail when the clips become loose, or damaged by corrosion. Replace the battery with one with the same type size, voltage, and size to correct the problem. If the key fob was exposed to water, it is recommended to clean it with a paper towel and isopropyl alcohol. This will stop further corrosion and damage. It is essential to let the electronics dry completely before you replace the battery. Contacts for the battery that are defective The key fob on your Leon has metal clips that hold the battery and complete the circuit. If these clips aren't properly tensioned they could cause contact issues. This is also a common problem when the battery has been replaced with a battery that's the wrong size or voltage. The best solution to correct this is to replace the old battery by a new one. Choose a battery of the same size and voltage as the original. The fob may also stop working if battery contacts are faulty or there is water damage, 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 aren't working It could be the right an appropriate time to seek out a specialist auto locksmith. UK Auto Locksmith can help you with a variety of car key services such as reprogramming your key chip. They provide competitive rates and are highly qualified to take care of the repair of your car keys. Faulty receiver module The key fob of the seat Leon is a tiny device that sends signals to your vehicle. If the signals aren't correctly received, the car's immobilizer system could stop working. This could be because of interference from objects, poor weather conditions, or transmitters on the same frequency band. The key fob might still function however, only within the limits of a small range. Metal clips keep the battery in place within the key fob. If these are corroded or worn out the contact points could fail. It is easy to replace the battery on your key fob, but be sure it's the same size and voltage. If your key fob has stopped functioning properly it could be time to replace the battery or the receiver module. This issue can be addressed by a professional at the lowest cost. You can also reprogram the key fob yourself, saving money on paying the dealer to complete the process. A professional can also help you with other issues, for instance an issue with your 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 using radio waves, however these can be scrambled by a lot of interference. This could be due to satellites or broadcast towers. seat key cover of interference can also alter the range of your remote. If your remote is working from a short distance put it near your chin or head to see if this fixes the issue. In the majority of cases, a Leon key fob that has stopped functioning can be repaired by resetting the receiver module. This can be accomplished by taking out the 12 volt battery for a couple of minutes (first the negative cable first, then the positive cable). The key fob will then be working normal. If not, you'll need to visit an authorized dealer for reprogramming. You may also use an OBDDII scanner to diagnose the problem. It could be that the electronic chip in the key fob has developed a fault which will require replacement. This is more likely in the event that the keyfob was exposed to salt or water.