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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 factors. One of them is dead batteries, water damage to the receiver module, radio interference and damaged coin batteries. Make sure to replace a lost or damaged key with the correct size and type. Also, be sure the new key is programmed to your vehicle. Dead coin battery The most frequent reason for your seatleon key fob not working is a dead battery. It is a simple fix that should only take just a few minutes. The issue could also result from worn out buttons or water damage, or interference in the signal as well as receiver module issues. The problem can be solved through an OBDII scan, or by reprogramming the key fob. The coin battery that is inside the key fob is an essential element of the remote keyless ignition system in your Seat Leon. It is fixed by metal clips. These clips complete the circuit and transmit power to receiver module. If the clips are loosened or are corroded, it could cause the circuit to fail. To fix the problem replace the battery one that is the same size, voltage and type. If the key fob was exposed it is recommended to clean it with isopropylethanol and paper towel. This will help prevent further corrosion or 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 comes with metal clips that bind the battery and complete the circuit. If these clips aren't properly tensioned it could result in problems with contact. This is also common when the battery has been replaced with a unit that's the wrong size or voltage. The best way to correct this is to replace the old battery with a fresh one. Make sure to use the same voltage and size as the original. The fob can also stop working if contacts on the battery are damaged or there's water damage, signal interference or a 12- volt dead battery. In this scenario you'll need to shut off the 12 volt battery for a couple of minutes. After doing so, reconnect the negative and positive cables. If your Seat Leon keys don't work then you might need to contact an auto locksmith professional. UK Auto Locksmith offers a variety of services for car keys including programming key chips. They offer reasonable rates and are skilled to handle your car keys repair needs. Receiver module that is defective The key fob of a seat leon is a tiny device that transmits signals to the vehicle. If seat key cover are not properly received, the vehicle's immobilizer may not function properly. This can be caused by interference from objects, poor conditions in the weather, or transmitters that use the same frequency band. The key fob may still work within a limited range. Metal clips hold the battery in in the key fob. Contact points may fail if these are corroded, worn out or rusted. You can replace the battery on your key fob easily however, you must make sure that it's the same size and voltage as the original. If your key fob does not allow you to start your car, you may need to replace the receiver module or the battery. This problem can be fixed by a professional at very little cost. They can also reprogram your key fob, which will save you money from having to pay a dealership to do it for you. A professional can also assist you with other issues, like an issue with your TIPM (transmission immobilizer control unit). They can also install a new ignition switch or sensor. Radio interference The key fob communicates with your car using radio waves, however they can be squelched by a lot of interference. This can occur from broadcast towers, airplanes and even satellites. This kind of interference could also affect the range of your key is able to reach. If your remote operates only from a limited distance try placing it near your chin or head and test to see if it fixes the problem. Resetting the receiver module can be enough to fix the problem of a Leon keyfob that stopped functioning. This can be done by removing the battery for a few minutes (first, the negative cable and then the positive). The key fob should then function normally. If this doesn't work, you'll be required to visit a dealership authorized for reprogramming. You can also use an OBDDII scanner to diagnose the issue. It is 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 salt or water.