Why Your Seat Leon Replacement Key Won't Work If you're Seat Leon remote key stopped working abruptly, there are several possible causes They could be caused by a dead coin battery, water damage, problems with the receiver module, and radio interference Make sure to replace a lost key using the correct type and size Also, make sure that the new key is programmed to 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 easy to fix and should only take about a minute However, the problem may be caused by damaged buttons, worn buttons and signal interference as well as receiver module issues The problem can be solved by a scan of the OBDII 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 fitted with clips made of metal to keep it in position and complete the circuit to send power to the receiver module If the clips are loosened or corroded, they can cause the circuit to fail Replace the battery with a brand new one with the same type size, voltage, and size to correct the issue If the key fob was exposed it is recommended to clean it with isopropylethanol and paper towel This will help prevent further corrosion and damage You should also allow the electronics to fully dry before replacing the battery Contacts for the battery that are defective The key fob on your Leon is equipped with metal clips that hold the battery and complete the circuit If these aren't properly tensioned it could result in contact issues This can happen even if the battery has been replaced with one that's wrong size or voltage This can be corrected by replacing the old battery with a brand new one Use a battery that is exactly the same size and voltage as the original The fob can also stop working due to faulty battery contacts signal interference, water damage, or the battery is dead In this instance you'll have to disconnect the 12 volt battery for a few minutes Reconnect the positive and negative cables following If https//wwwthekeylabcouk/seat-car-keys/ don't work it is possible to contact a professional auto locksmith UK Auto Locksmith offers a variety of services for car keys including programming key chips They have affordable rates and are well trained to handle car keys repair needs The receiver module is not working properly The key fob of the seat Leon is a small device that transmits signals to your car If these signals are not properly received, the vehicle's immobilizer system may stop working This could be due to interference from objects, bad weather conditions, or transmitters operating on the same frequency band The key fob could operate within a specific range The battery in the key fob is secured by retaining clips made of steel If they are corroded or worn out the contact points could fail You can replace the battery in your key fob quickly, but you must ensure that it's the exact size and voltage as the original If your key fob does not allow you to start your vehicle, you may have to replace the receiver module, or the battery This problem can be fixed by a professional at an affordable cost You can also change the code of the key fob on your own and save money by not having to pay the dealership to complete the process Experts can also assist with other issues, such as a malfunctioning TIPM transmission-immobilizer control unit They can also fix the ignition switch or sensor Radio interference The key fob communicates with your car using radio waves, however these signals can be mangled due to a large amount of interference This can be due to broadcast towers, airplanes, and even satellites This kind of interference can also affect the range of your key is able to reach If your remote key is working from a short distance, try placing it next to your chin or head to see if it fixes the problem Resetting the receiver module is typically enough to fix the problem of a Leon keyfob which has stopped functioning You can do this by removing the battery for a couple of minutes first the negative cable and then the positive cable Afterwards the key fob will function as usual If not, you may be required to visit an authorized dealer to reprogramme the You can also utilize an OBDDII scanner to identify the issue It is possible that the electronic chips in the key fob have developed an issue and require replacement This is more likely when the key fob has been exposed salt or water