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Seat Leon Key Fob Replacement If your seat leon key fob has stopped working, it is not required to be replaced or reset. First, you should check the battery. Most fobs come with a slider, switch or tiny gaps you can use to open and replace the battery. Use the same type of battery as the original. Dead coin battery A dead battery is one of the most common causes for a key-fob not working. Replacing it is inexpensive and takes just few minutes, however the first thing to be sure to make sure you're using the right type of battery. Most key fobs are powered by CR2032 batteries (3V) that can be found in most electronic stores or on the internet. The owner's guide or YouTube video will provide the instructions on opening the key fob, and then replacing its battery. Water Damage Even even if your Leon key fob is waterproof prolonged exposure to salt water can cause damage to the internal electronic chip that controls the remote. In some instances it could also prevent the key fob from communicating with the vehicle. You'll need to clean it with isopropyl or an electronic cleaner, and then dry it prior to placing the battery back. If it's not the battery that's the issue the buttons may have become misaligned from constant use. A careful visual inspection will determine if the buttons are damaged or loose and then put back together. You can attempt this yourself or bring the key fob in to an auto repair shop to be repaired. Depending on the severity of the problem you may have to replace the entire remote. Contacts of the battery may be damaged. A damaged or defective battery contact is one of the most common reasons for a keyfob not working. G28 could be due to water or dirt inside the case of your key fob, or simple wear and wear and. The solution is to clean the battery contacts using isopropyl alcohol. This will restore communication between the microprocessor, the battery and the key fob. The battery can be changed in your Leon keyfob by tearing the two halves apart with a flat screwdriver. A new battery is cheap and can be purchased at any electronics store. Follow the steps in the owner's guide when removing the old battery and installing the new one. You can also reset the remote keyless by disconnecting the battery for a couple of minutes. This will reset all the onboard computer components and help to restore the capability of your key fob to communicate with the car. If the issue continues it is recommended that you contact a dealer to reprogram your key. They will utilize an OBDII scanner to diagnose the issue and may be capable of reprograming your key fob, without the need for another original key. This process is usually completed within less than a half hour. The dealer will also be able to reset the immobilizer. Water damage It's essential to act immediately if the key fob has been soaked by water. Water and electronics aren't an ideal combination and could cause damage to the circuit board. A key fob that's wet could also cause it to not function properly which is why it's so important to take care of this issue as soon as possible. If you accidentally dropped your keyfob into an aquisition or pool or washed it by mistake, you should remove the battery first, and let it dry completely. You can also use a paper towel or tissue to dry the casing. You could also put it in a bag filled with silica gel packs, which helps to absorb the moisture. Once your key fob's completely dry, it's time to put it back together. Make sure that the battery is securely inserted and that the contacts made of metal on the circuit board are clean. You can use a small amount of isopropyl alcohol to cleanse these areas if required. After all that, you should be successful in getting your vehicle to start by using the key fob. If it's not working it could be necessary to fix other issues. It could be a malfunctioning key or a transponder that must be reprogrammed. A malfunctioning receiver module If your key fob stopped working after dropping it on the ground or suddenly stopped working out of no-time and you've tried everything, including replacing the battery, reprogramming, and even using a spare It could be the time to replace the receiver module. The electronic component transmits signals to other components in the car, for example, the immobilizer. The security system of your car will not work without a functioning receiver module. You won't be able to start your vehicle. If the receiver module in your seat leon is damaged or not sending the correct radio frequency signals you'll see an error code on the instrument panel. In most cases, the problem can be resolved by connecting an OBDII scanner to the vehicle's diagnostic port and examining it for errors. Then, you can try reprogramming the key using a dealer-supplied programmer and check if that resolves your problem. Key fobs take a lot of abuse, so they aren't indestructible. The most common points of failure are the battery terminal contacts as well as buttons. With a little effort, you are able to repair or replace these. If the key fob batteries in your car are not working and you want to check the voltage, use the help of a voltmeter. If the battery's voltage is less than 3 Volts, it is time to replace it. You can purchase an appropriate replacement battery at any electronic store or auto parts center.