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Why Your Seat Leon Replacement Key Won't Work? Seat Leon remote keys that suddenly stop working could be caused by a variety of causes. Some of them include: dead batteries or water damage to receiver module, radio interference and an unrepaired coin battery. If you are replacing a key that has been lost ensure that you replace it 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 reason for your seat's key fob not working. This is a simple fix that should only take a couple of minutes. The issue could be caused by worn-out buttons, water damage or interference in the signal as well as receiver module issues. These issues can be fixed through an OBDII scan, or by reprogramming your key fob. The coin battery inside 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 energy to the receiver module. If the clips are loosened or have corrosion, it could cause the circuit to fail. To fix the issue replace the battery with one of the same size, voltage and type. If the key fob was exposed to water, it is recommended to clean it using isopropyl ethanol and paper towel. This will help avoid further damage or corrosion. Also, you should 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 bind the battery and complete the circuit. Contact issues can occur when these clips are not properly tensioned. This is also the case when you replace the battery with the wrong sizes or voltages. This can be corrected by replacing the old battery with a brand new one. Choose a battery of similar in size and power as the original. The fob can also stop working if the contacts to the battery are defective or if there is water damage, there is signal interference, or a 12 volt dead battery. In this case, you'll need to disconnect the battery that is 12 volts for a short period of time. Reconnect the positive and negative cables following. If your Seat Leon keys aren't working it could be time to contact a specialist auto locksmith. UK Auto Locksmith offers a variety of services for car keys including the reprogramming of key chips. They offer competitive prices and are highly qualified to solve the needs of repairing your car keys. A malfunctioning receiver module The key fob on the seat leon is a tiny device that sends signals to the vehicle. If these signals aren't correctly received, the car's immobilizer may not function properly. This could be due to interference from objects, poor weather conditions, or transmitters that use the same frequency band. The key fob may still operate in a limited range. The battery in the key fob is secured by retaining clips made of steel. If they get corroded or worn out the contact points might fail. seat leon replacement key cost is easy to replace the battery on your key fob, but be sure that it's the same size and voltage. If your key fob won't running the car and it is not working, it could be time to replace the battery or the receiver module. A professional can repair this problem for a low cost. You can also modify the key fob yourself to save money from paying the dealer to perform the task. Professionals can also help you with other issues, 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 communicates with the car using radio waves, but these can be scrambled by a variety of interference. This can happen from broadcast towers, airplanes and even satellites. This kind of interference could also impact the range of your key. If your remote is working from a limited distance you can try placing it near your head or chin to see if it fixes the issue. Resetting the receiver module can be enough to fix the problem of a Leon keyfob that has stopped functioning. This can be accomplished by removing the battery with 12 volts for a short period of time (first the negative cable followed by the positive). Then the key fob will perform as expected. If not, you may be required to visit an authorized dealer to reprogramme the. Alternately, you could use an OBDII scanner to identify the root of the issue. It's possible that the electronic chips in the key fob have developed faults and need to be replaced. This is more likely to happen when the keyfob is exposed to water or salt.