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Why Your Seat Leon Replacement Key Won't Work? If you're Seat Leon remote key stopped working abruptly, there are various possible causes. Some of these include: dead batteries or water damage to receiver module, radio interference and damaged coin batteries. Make sure you replace a lost key using the correct size and type. Also, make sure that the new key is programmed to your vehicle. Dead coin battery The most frequent reason for your seatleon key fob not working is a dead coin battery. This is an easy repair and will only take a few minutes. However, the problem may be caused by damaged buttons, water damage and signal interference as well as receiver module issues. These issues can be resolved with an OBDII scanner or reprogramming your 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 held in place by metal clips. These clips complete the circuit and send power to the receiver module. The circuit may fail if the clips are loose, or corrosion has occurred. To fix the issue replace the battery with one of the same size, voltage, and type. If the key fob was exposed to water, it is suggested to clean it with a paper towel and isopropyl alcohol. This will prevent further corrosion and damage. Also, you should allow the electronics to dry completely before replacing the battery. Faulty battery contacts The key fob of your Leon features metal retaining clips that keep the battery in place and complete the circuit. Contact issues can arise if these clips are not properly tensioned. This is also a common problem when the battery was replaced with one that's the wrong size or voltage. This can be corrected by replacing the old battery with a brand new one. Make sure to use a battery that's identical in size and voltage as the original. seat leon replacement key cost may be inoperable due to malfunctioning battery contacts damaged or leaking water, signal interference or the battery is dead. In this scenario you'll need to unplug the 12 volt battery for a short period of time. Reconnect the negative and positive cables afterward. If you're Seat Leon keys aren't working it could be the right time to call a professional auto locksmith. UK Auto Locksmith can help you with a wide range of key replacement services for cars that include reprogramming the key chip. They offer low prices and are skilled to handle your car keys repair needs. Receiver module that is defective The key fob on the seat leon is a tiny device that transmits signals to the vehicle. If the signals aren't properly received, the vehicle's immobilizer system could stop working. This could be due to interference from objects, bad weather conditions, or transmitters that are on the same frequency band. The key fob could work, but only within the range of a few meters. The battery inside the key fob is held in place by clips made of metal. Contact points can fail if these are worn out, corroded or rusted. You can replace the battery in your key fob easily however you must ensure that it is the same size and voltage as the original. If your key fob's remote does not work to start the vehicle, you may have to replace the receiver module, or the battery. The issue can be resolved by a professional at very little cost. You can also modify the key fob yourself which will save you money instead of having to pay a dealership to perform the task. A professional can also help you with other issues, like an issue with your TIPM (transmission immobilizer control unit). They can also install a new ignition switch or sensor. Radio interference The key fob communicates with the car using radio waves, but they are susceptible to being snuffed out by a variety of interference. This can occur from broadcast towers, airplanes, and even satellites. This kind of interference could also affect the range of your remote. If your remote is working from a short distance, try placing it on your chin or head to see if it solves the problem. Resetting the receiver module will usually be enough to repair a Leon keyfob which has stopped working. This can be done by taking out the 12 volt battery for a few minutes (first the negative cable, then the positive). The key fob should then be working normally. If this doesn't work, you'll be required to visit a dealership authorized to reprogramme the. You can also utilize an OBDDII scanner in order to determine the issue. It is possible that the electronic chip inside the key fob has developed a fault, which requires replacement. This is more likely if the keyfob has been exposed salt or water.