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 them include dead batteries or water damage to receiver module, radio interference and the battery of your coin is damaged Make sure you replace the lost key with 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 seat leon key fob not working is a dead coin battery It's a simple fix that takes only a couple of minutes The problem can also be caused by worn-out buttons as well as water damage or interference in the signal, as well as receiver module issues These issues can be fixed by using an OBDII scanner, or reprogramming of the key fob The coin battery that is inside the key fob is an important part of the remote keyless ignition system that is found in your Seat Leon It is secured by metal clips These clips complete the circuit, and supply power to the receiver module If the clips are damaged or have corrosion, it can cause the circuit to fail Replace the battery with a new one that is the same model, voltage, and size to fix the problem If the key fob was exposed to water it is recommended that you clean it with isopropylethanol and a paper towel This will 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 comes with metal clips that bind the battery and complete the circuit Contact issues can occur if these clips are not properly tensioned This can also happen if you replace the battery with one of the wrong voltage or dimensions The best method to remedy this is to replace 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 be unable to function if the contacts on the battery are damaged or there's water damage, signal interference or a 12 volt dead battery In this situation, disconnect the 12 volt batteries for a few minutes After that, reconnect the negative and positive cables If your Seat Leon keys don't work it is possible to contact an experienced auto locksmith UK Auto Locksmith offers a range of services for car keys including the reprogramming of key chips They have affordable rates and are well trained to handle car keys repair requirements Receiver module that is defective The key fob on a 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 use the same frequency band Key fobs can function however, only within a short range Metal clips keep the battery in place inside the key fob If they are corroded or worn out the contact points may fail You can easily replace the battery in your key fob, but be sure that it's the same size and voltage If your key fob's remote does not start your car, you may need to replace the receiver module or the battery This problem can be fixed by a professional for a low price https//wwwthekeylabcouk/seat-car-keys/ can also reprogram your key fob which will save you money by not the expense of hiring a dealer to complete the process for you Professionals can also assist you with other issues like an issue with your TIPM transmission-immobilizer control unit They can also repair the ignition switch or sensor Radio interference The key fob communicates with the car using radio waves, but these can be scrambled by a wide range of interference This can happen from broadcast towers, airplanes, and even satellites This type of interference can also affect the range your remote's range If your remote key is only working from a narrow distance, try placing it near your chin or head to see if this fixes the problem Resetting the receiver module will usually be enough to repair the problem of a Leon keyfob that stopped working This can be done by taking the battery off for a couple of minutes first the negative cable, then the positive Then the key fob will work as normal If not, you'll have to visit an authorized dealer to reprogram the You may also use an OBDDII scanner to diagnose the issue It is possible that the electronic chips in the key fob have developed a fault and will need to be replaced This is more likely if the keyfob has been exposed salt or water