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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 myriad of causes. Some of these include: dead batteries water damage to the receiver module, radio interference and damaged coin batteries. Before replacing a lost or damaged key ensure that you replace it with the correct size and type. Also, ensure that the new key is programmed to your vehicle. Dead coin battery A dead coin battery is the most frequent cause of your seat's key fob not working. This is a straightforward fix that takes only just a few minutes. The issue may also be caused by worn buttons or water damage, or interference in the signal and receiver module issues. These issues can be fixed with an OBDII scanner or by reprogramming the 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 transmit energy to the receiver module. The circuit may fail when the clips become loose or have damaged by corrosion. To fix the issue replace the battery one that is the same size, voltage, and type. If the key fob was exposed it is recommended that you clean it using isopropyl ethanol and paper towel. This will help prevent further damage or corrosion. It is essential to allow the electronics to dry completely before you replace the battery. Contacts to the battery are not working properly. The key fob of your Leon is fitted with metal clips that bind the battery and complete the circuit. If thekeylab.co.uk aren't properly tensioned it could result in contact issues. This is also common if the battery has been replaced with a unit that's the wrong size or voltage. The best way for fixing this issue is to replace the old battery by a new one. Be sure to use a battery of the same size and voltage as the original. The fob might also stop working if battery contacts are faulty or there's water damage, there is signal interference or a 12 volt dead battery. In this situation you'll need to unplug the 12 volt battery for a few minutes. Reconnect the negative and positive cables afterward. If your Seat Leon keys aren't working, it may be an appropriate time to seek out a specialist auto locksmith. UK Auto Locksmith offers a range of services for car keys including changing the chip on your key. They provide competitive rates and are well-trained to handle the needs of repairing your car keys. Faulty receiver module The seat leon key fob is a tiny device that transmits signals to the vehicle. If these signals aren't correctly received, the car's immobilizer mechanism may cease to function. This could be due to interference from objects, bad weather conditions, or transmitters that use the same frequency band. The key fob may still operate in a limited range. Metal clips hold the battery in place in the key fob. Contact points may fail if they are worn out, corroded, or damaged by rust. You can replace the battery in your key fob with ease however you must ensure that it's the exact size and voltage as the original. If your key fob will not work to start the vehicle, you may have to replace the receiver module, or the battery. A professional can fix the issue at a reasonable cost. You can also change the code of the key fob on your own which will save you money instead of having to pay the dealer to repair it. A professional can also assist you with other issues, for instance a faulty TIPM (transmission immobilizer control unit). They can also install a brand new ignition switch or sensor. Radio interference The key fob utilizes radio waves to communicate with the car, but these signals may be mangled if there is a large quantity of interference within. This can occur from broadcast towers, airplanes and even satellites. This type of interference could also impact the range of your remote. If your remote key operates from a short distance Try placing it next to your chin or head to see if this fixes the issue. In most cases the case of a Leon key fob that stops functioning can be easily fixed by resetting the receiver module. You can do this by disconnecting the battery for a few minutes (first the negative cable and then the positive cable). After that the key fob should be functioning as normal. If not, you'll require a visit to an authorized dealer to reprogramme the. You can also utilize an OBDDII scanner to diagnose the problem. It is possible that the electronic chip inside the key fob has developed a fault, that will require replacement. This is especially true when the key fob has been exposed to salt or seawater.