Why Your Seat Leon Replacement Key Won't Work Seat Leon remote keys that suddenly stop working may be caused by a variety of causes These include the battery of your coin is dead, water damage, receiver module issues and radio interference Make sure you replace the lost key with the correct size and type Also, make sure that the new key is programmed for your vehicle Dead coin battery A dead coin battery is the most common cause of your seat leon's key fob not working This is an easy fix and can be done in just about a minute However, the issue could also be caused by damaged buttons, water damage or signal interference receiver module issues These issues can be fixed by using an OBDII scanner, or reprogramming of the key fob The coin battery in the key fob is an essential part of the remote keyless ignition system of your Seat Leon It is held in place by steel clips These clips complete the circuit and transmit energy to the receiver module The circuit may fail when the clips become broken or damaged or corroded Replace the battery with a brand new one of the same kind in size, voltage, and type to correct the issue If the key fob was exposed to water, it is recommended that you clean it using isopropyl ethanol and a paper towel This will stop further corrosion and damage It is crucial to allow the electronics to dry completely before you replace the battery Contacts of the battery may be damaged The key fob of your Leon is equipped with metal clips that secure the battery and complete the circuit Contact issues can happen if the clips aren't properly tensioned This is also a common problem when the battery was replaced with a battery that's the wrong size or voltage The best solution to remedy this is to replace the old battery with a fresh one Make sure you use a battery of the same voltage and size as the original The device may stop working due to faulty contacts on the battery damaged or leaking water, signal interference, or a dead 12 volt battery In this case, disconnect the 12 voltage batteries for a couple of moments After that, connect the positive and negative cables If you're Seat Leon keys aren't working it could be an appropriate time to seek out a specialist auto locksmith UK Auto Locksmith can help you with a variety of key replacement services for cars that include reprogramming the key chip They provide competitive rates and are highly qualified to handle the repair of your car keys A malfunctioning receiver module The key fob for the seat leon is a small device that transmits signals to your vehicle The immobilizer of the vehicle can stop working in the event that these signals are not received correctly This could be due interference from objects, poor weather conditions, or transmitters operating on the same frequency band The key fob could operate within a specific range Metal clips hold the battery in place in the key fob Contact points may fail if they're worn out, corroded or damaged by rust You can easily replace the battery in your key fob, but make sure it's the exact size and voltage If your key fob will not work to start the vehicle, you may have to replace the receiver module or battery A professional can fix this problem for a low cost They can also reprogram your key fob, which will save you money from needing to pay a dealer to perform the task for you Professionals can also assist you with other issues like the malfunctioning TIPM transmission-immobilizer control unit https//wwwthekeylabcouk/seat-car-keys/ can also install a 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 amount of interference around This can happen from broadcast towers, airplanes and even satellites This type of interference can also affect the range of your remote If your remote is operating from a small distance you can try placing it on your chin or head to see if it fixes the issue In most cases the case of a Leon key fob that has stopped functioning can be repaired by resetting the receiver module It is as simple as dismantling the battery for a couple of minutes first the negative cable and then the positive Then the key fob will perform as expected If not, you may need to visit an authorized dealer to reprogramme the Alternately, you could employ an OBDII scan tool to identify the root of the issue It's possible that the electronic chips inside the key fob have developed an issue and will require replacement This is more likely to happen in the event that the keyfob was exposed salt or water