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Why Your Seat Leon Replacement Key Won't Work? If you're Seat Leon remote key stopped working at a sudden point, there are many possible reasons. Some of these include: dead batteries water damage to the receiver module, radio interference, and an unrepaired coin battery. When replacing a lost key, make sure the replacement key is of the correct size and type. Also, ensure that the new key is programmed to your vehicle. Dead coin battery The most common reason behind your seat leon key fob not working is a dead coin battery. It's a simple fix that takes only some minutes. However, the issue could be caused by worn buttons, water damage or signal interference, as well as receiver module problems. The problem can be solved by a scan of the OBDII or by reprogramming the key fob. The coin battery inside the key fob of your Seat Leon is a very important part of the remote keyless system. It is equipped with metal clips which keep it in place and complete the circuit that supplies power to the receiver module. The circuit could fail in the event that the clips are damaged, broken or corrosion has occurred. Replace the battery by purchasing a new one of the same kind in size, voltage, and type to fix the issue. If the key fob has been exposed to water, it is recommended to clean it with paper towel and isopropyl alcohol. This will help prevent further corrosion and damage. It is important to allow the electronics to completely dry before replacing the battery. Contacts for the battery that are defective The key fob on your Leon is equipped with metal clips to secure the battery and complete the circuit. If they're not properly tightened, it can cause problems with contact. This could also happen when you replace the battery with one of the wrong voltage or size. The best way to remedy this is to replace the old battery by a new one. Be sure to use the same size and voltage as the original. The fob might be unable to function if the battery contacts are faulty or there is water damage, there is signal interference or a 12- volt dead battery. In this situation you'll need to shut off the 12 volt battery for a couple of minutes. After doing so, reconnect the negative and positive cables. If your Seat Leon keys don't work then you might need to contact a professional auto locksmith. UK Auto Locksmith offers a variety of car key services including the reprogramming of key chips. They offer competitive rates and are highly qualified to take care of the needs of repairing your car keys. Faulty receiver module The key fob of the seat Leon is a small piece of equipment that transmits signals to your car. The immobilizer system in the car may stop working when these signals aren't received in a timely manner. This could be due interference from objects, poor weather conditions, or transmitters on the same frequency band. hop over to this web-site can work but only within the range of a few meters. The battery in the key fob is held in place by metal retaining clips. Contact points may fail if they're worn out, corroded or rusted. It is easy to replace the battery in your key fob, but make sure that it's the same size and voltage. If your key fob won't working to start the car, it may be time to replace the battery or the receiver module. A professional can repair the issue at a reasonable cost. They can also reprogram your key fob which will save you money from having to pay a dealership to help you. A professional can also assist you with other issues, such as a faulty TIPM (transmission immobilizer control unit). They can also install a new ignition switch or sensor. Radio interference The key fob communicates with the car by radio waves, but they can be squelched by a variety of interference. This could be caused by broadcast towers, airplanes and even satellites. This kind of interference could also affect the range your key is able to reach. If your remote key operates from a short distance, try placing it next to your chin or head to see if it fixes the problem. In the majority of cases the case of a Leon key fob that stops functioning can be easily repaired by resetting the receiver module. It is as simple as removing the battery for a few minutes (first, the negative cable and then the positive cable). Then the key fob will perform as expected. If it does not work, you'll be required to visit a dealership authorized for reprogramming. Additionally, you can employ an OBDII scan tool to pinpoint the source of the problem. It is possible that the chip inside the key fob has developed a fault, that will require replacement. This is more likely when the key fob has been exposed salt or water.