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Why Your Seat Leon Replacement Key Won't Work? Seat Leon remote keys that suddenly stop working could be caused by a variety of factors. There are a variety of reasons to blame. a dead battery or water damage to the receiver module, radio interference and a damaged coin battery. When replacing a lost key, make sure the replacement is the correct size and type. Also, make sure that the new key has been programmed for your vehicle. Dead coin battery The most frequent reason for your seat leon key fob not working is a dead coin battery. This is easy to fix and can be done in just a few minutes. However, the issue could also be caused by worn buttons, water damage and signal interference as well as receiver module issues. These issues can be fixed by using an OBDII scanner, or by reprogramming the key fob. The battery inside the key fob of your Seat Leon is a very important part of the remote keyless system. It is fitted with clips made of metal that keep it in place and also complete the circuit to supply power to the receiver module. If the clips become loose or are corroded, it could cause the circuit to fail. Replace the battery with a new one of the same kind in size, voltage, and type to fix the problem. If the key fob was exposed to water it is recommended that you clean it using isopropyl alcohol and a paper towel. This will prevent further corrosion and damage. You should also allow the electronics to fully dry before replacing the battery. Faulty battery contacts The key fob of your Leon is fitted with metal clips to secure the battery and complete the circuit. If they're not properly tensioned they could cause problems with contact. This could also occur if you replace the battery with one of the wrong sizes or voltages. The best method to fix this is to replace the old battery with a fresh one. Choose a new battery that is identical in size and voltage as the original. The device may stop working due to faulty battery contacts water damage, signal interference, or a dead 12 volt battery. In this case, disconnect the 12 voltage batteries for a couple of seconds. Reconnect the positive and negative cables following that. If your Seat Leon keys aren't working, it may be the time to speak with a specialist auto locksmith. UK Auto Locksmith offers a variety of car key services including changing the chip on your key. They offer low prices and are equipped to handle your car keys repair needs. bmw key fob seat memory for the seat leon is a small piece of equipment that transmits signals to your vehicle. If the signals aren't correctly received, the car's immobilizer system could stop working. This can be due to interference from objects, bad weather conditions, or transmitters operating on the same frequency band. The key fob might still function but only within the range of a few meters. The battery inside the key fob is held in place by retaining clips made of steel. If these are corroded or worn out the contact points might fail. You can easily replace the battery on your key fob, but make sure that it's the same size and voltage. If your key fob won't starting the car, it may be time to replace the battery or the receiver module. The issue can be resolved by a professional for an affordable cost. You can also change the code of the key fob on your own which will save you money instead of the cost of hiring a dealer to complete the process. A professional can also assist you with other issues, like 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 uses radio waves to communicate with the car, however the signals can be mangled when there is a huge amount of interference nearby. This could be due to broadcast towers or satellites. This kind of interference can also affect the range of your key is able to reach. If your remote is working from a short distance, try placing it on your chin or head to see if that fixes the problem. Resetting the receiver module will usually be enough to repair the problem of a Leon keyfob that isn't working. You can do this by disconnecting the battery for a few minutes (first then, the negative cable, and then the positive cable). The key fob will then work normal. If not, you'll have to visit an authorized dealer to reprogramme the. You can also employ an OBDDII scanner in order to determine the issue. It could be that the electronic chip within the key fob has developed a fault, that will require replacement. This is more likely to happen when the key fob has been exposed to water or salt.