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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 myriad of causes. Some of these include: dead batteries, water damage to the receiver module, radio interference and a damaged coin battery. Make sure to replace a lost or damaged key with the correct type and size. Also, ensure that the new key is programmed for your vehicle. Dead coin battery A dead battery for your coin is the most common cause of your seat's key fob not working. This is a simple fix that takes only about a minute. The problem can also be caused by worn-out buttons as well as water damage or interference in the signal, as well as receiver module issues. These issues can be addressed with an OBDII scan tool or by reprogramming the key fob. seat spare key in the key fob of your Seat Leon is a very important part of the remote keyless system. It has metal retaining clips which keep it in position and complete the circuit to send power to the receiver module. If the clips are loosened or corroded, they could cause the circuit to fail. To fix the issue replace the battery with one that is the same size, voltage, and type. If the key fob was exposed it is recommended to clean it using isopropyl alcohol and a paper towel. This will help prevent further corrosion and damage. It is important to allow the electronics to dry completely before you replace the battery. Faulty battery contacts The key fob on your Leon comes with metal clips that hold the battery and complete the circuit. If these clips aren't properly tensioned they could cause contact issues. This could also happen if you replace the battery with one of the wrong sizes or voltages. This can be fixed by replacing the old battery with a new one. Make sure you choose the same size and voltage as the original. The fob can also fail due to damaged contacts on the battery, signal interference, water damage, or a dead 12 volt battery. In this situation, disconnect the 12 voltage batteries for a couple of minutes. Reconnect the negative and positive cables afterward. If your Seat Leon keys don't work and you are unable to use them, it's best to call an auto locksmith professional. UK Auto Locksmith offers a range of car key services including the reprogramming of key chips. They provide competitive rates and are well-equipped to handle the repairs to your car key. A malfunctioning receiver module The key fob for 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 can be caused by interference from objects, poor conditions in the weather, or transmitters that utilize the same frequency band. The key fob might operate in a limited range. Metal clips keep the battery in in the key fob. If they get corroded or worn out the contact points might fail. You can replace the battery in your key fob easily however, you must make sure that it's the exact size and voltage as the original. If your key fob has stopped working to start the car it might be time to replace the battery or receiver module. This issue can be solved by a professional at the lowest cost. You can also program the key fob by yourself which will save you money instead of having to pay the dealer to repair it. Professionals can also assist you with other issues, such as a malfunctioning TIPM (transmission-immobilizer control unit). They can also help you replace the ignition switch or sensor. Radio interference The key fob communicates with the car by radio waves, but they are susceptible to being snuffed out by a variety of interference. This could be due to satellites or broadcast towers. This type of interference can also affect the range of your key. If your remote key operates only from a limited distance, try placing it near your chin or forehead and test to see if it fixes the problem. Resetting the receiver module can be enough to repair the issue. Leon keyfob which has stopped working. This can be done by removing the battery of 12 volts for a few minutes (first the negative cable first, then the positive). The key fob should function normally. If this doesn't work, you'll have to visit a dealer authorized to reprogramme your. Alternatively, you can also make use of an OBDII scanner in order to determine the cause of the issue. It is possible that the electronic chip within 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.