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Seat Leon Key Fob Replacement If your seat Leon key fob has stopped working it's not necessary to be replaced or reprogrammed. The first thing you should look at is the battery. You can remove the battery out of many fobs using a small gap, switch, or slider. Make sure to use the same type of battery as the original. Dead coin battery A battery that is dead is among the most frequent reasons for a key fob that isn't working. It's not expensive and takes only about a minute, but the first thing you must be sure to make sure you're using the correct type of battery. The majority of key fobs are powered by CR2032 batteries (3V) which are available in a majority of electronic stores and online. The owner's manual or YouTube video should give you the steps on opening the key fob and replacing its battery. Water Damage Even if the Leon key fob is coated with an impervious coating, prolonged exposure to saltwater can damage the electronic chip in the remote. In some instances it could also prevent the key fob from communicating with your vehicle. To fix this, you will need to clean the chip using alcohol or an electronic cleaner and dry it completely before placing the battery back. If you don't think the battery is the issue, the buttons could have become misaligned due to the constant use. If they're loose or damaged, you can use a soldering iron to gently secure them back in place. You can try it yourself or take the key fob to an auto shop for repair. Depending on the severity of the issue you may have to replace the entire remote. Contacts for the battery that are defective A damaged or defective battery contact is one of the most frequent reasons for keys not working. This could be due to dirt or water in the case of the key fob or simply wear and tear that happens over time. Isopropyl Alkohol can be used to clean the battery's contacts. This will restore the communication between the microprocessor, battery, and the key fob. You can change the battery on your Leon key fob by opening the two halves with a small screwdriver with a flat blade and then removing the old battery. You can purchase a replacement battery from any electronics retailer. Be sure to follow the instructions in the owner's guideline when replacing and removing the new battery. You can try resetting the remote keyless system by disconnecting the battery with 12 volts for a short period of time. This will reboot all the on-board computers and might help restore your key's ability to connect to the vehicle. If the issue continues you should consult an expert to reprogram your key. They will utilize an OBDDII scanner in order to determine the issue and may be able reprogram your key without the need for a replacement key. This process is usually completed within less than an hour. The dealer will also be able to reset the immobilizer. Water damage It's crucial to act immediately if your key fob is soaked in water. Water and electronics don't get along well and can damage the circuit board. A key fob that is wet is also likely to stop working which is why it's crucial to deal with this issue as quickly as you can. If you accidentally dropped your keyfob into a puddle or pool, or washed it accidentally then you must remove the battery first, and allow it to dry completely. You can also use paper towel or tissue to dry the outer casing. You can also put it in a bag filled with silica gel packs to aid in the absorption of water. Once your key fob is dried completely, it's now time to put it back together. Make sure the battery is securely in place and that the metal contacts on the circuit board are clean. You could use a small amount of isopropyl ethanol to clean these areas if needed. After all this, you should be successful in getting your vehicle to start by using the key fob. If it still won't start the vehicle, there may be other problems that need to be dealt with. This could be due to a damaged key or transponder that needs to be reset. The receiver module is not working properly. It could be time to replace your receiver if you have tried everything, including replacing the batteries, reprogramming and using an extra key fob. This is an electronic component that sends signals to other modules on the car including the immobilizer. The security system in your car won't work without a functioning receiver module. You won't be able to start your car. If the receiver module in your seat leon is damaged or isn't sending proper radio frequency signals, you'll see an error code on the instrument panel. Connecting an OBDII scanner to the vehicle's diagnosis port and examining for problems can often resolve the problem. Then, you can try reprogramming the key with a dealer-provided programmer and see if that solves the issue. Key fobs are subjected to many abuses, which is why they're not completely safe. The battery terminal contacts as well as the button are the most frequent failure points. www.g28carkeys.co.uk are easy to repair and replace with little effort. If the key fob batteries in your car aren't working and you want to check the voltage, use a voltmeter. If the battery's reading is lower than 3 Volts the time is now to replace it. You can find an appropriate replacement battery at any auto parts store or electronics center.