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Why Your Seat Leon Replacement Key Won't Work? If your Seat Leon remote key stopped working suddenly, there are a number of possible causes. These include: a dead coin battery, water damage, problems with the receiver module and radio interference. Make sure you replace the lost key with the correct size and type. Also, make sure that the new key has been programmed for your vehicle. Dead coin battery A dead battery for your coin is the most frequent cause of your seat leon's key fob not working. It is a simple fix that takes only a couple of minutes. The issue may also be caused by worn buttons, water damage or interference in the signal, and receiver module issues. These issues can be solved by a scan of the OBDII or by reprogramming the key fob. The coin battery that is located in the key fob of your Seat Leon is a very important component of your remote keyless system. It is fixed by metal clips. These clips complete the circuit, and supply power to receiver module. If the clips become loose or have corrosion, it can 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 to water, it is recommended to wipe it clean using a paper towel and isopropyl alcohol. This will stop further corrosion and damage. It is also recommended to allow the electronics to fully dry before replacing the battery. Contacts of the battery may be damaged. The key fob of your Leon includes metal clips that keep the battery in place and complete the circuit. If these aren't properly tensioned they could cause contact issues. This can happen even in the event that the battery was replaced with a battery that's the wrong size or voltage. This can be fixed by replacing the old battery with a new one. Make sure to use a battery that's the same size and voltage as the original. The fob may also stop working if battery contacts are faulty or if there is water damage, there is signal interference, or a 12 volt dead battery. In this situation you'll need to shut off the battery that is 12 volts for a few minutes. After that, reconnect the negative and positive cables. If your Seat Leon keys aren't working It could be the right time to contact a specialist auto locksmith. UK Auto Locksmith offers a variety of car key services including reprogramming key chips. They offer reasonable rates and are equipped to handle your car keys repair requirements. Receiver module that is defective The key fob on the seat leon is a small device that transmits signals to the vehicle. If the signals aren't correctly received, the car's immobilizer may not function properly. seat key cover can be caused by interference from objects, bad weather conditions, and transmitters that are on the same frequency band. The key fob could operate in a limited range. The battery in the key fob is held in place by metal retaining clips. If they get corroded or worn out the contact points could fail. You can easily replace the battery in your key fob, but be sure it's the exact size and voltage. If your key fob's remote does not work to start the car, you may need to replace the receiver module or battery. This issue can be solved by a professional at the lowest cost. They can also reprogram your key fob, which will save you money from having to pay a dealership to complete the process for you. Experts can also assist in other problems, such as a malfunctioning 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 around. This can be caused by satellites or broadcast towers. This kind of interference can affect the range of your key. If your remote key only operates from a small distance put it on your chin or head and check if this solves the issue. Resetting the receiver module is usually enough to repair a Leon keyfob that isn't working. This can be done by removing the battery for a couple of minutes (first the negative cable, and then the positive cable). After that the key fob should function as usual. If not, you may require a visit to an authorized dealer for reprogramming. Additionally, you can employ an OBDII scan tool to determine the cause of the issue. It could be that the chip inside the key fob has developed a fault which requires replacement. This is especially true when the key fob has been exposed to water or salt water.