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Citroen C3 Key Fob Replacement If your C3 key fob suddenly stopped functioning it could be because of malfunctioning components. If the key fob still works, it could be due to something else, like water damage or a dead battery. Citroen is aiming to reach the mass market with its eC3. It offers several features including virtual remote diagnosis as well as a dedicated app for customer service. Dead coin battery If the unlock button on the key fob doesn't work, it could be that the coin battery is defective. The battery is expected to last between three and four years with regular usage however, it could die in a sudden manner. The car makers have developed fail-safes that permit you to start and lock the car even if the key fob is dead. The battery inside the key fob is typically held in place by metal retaining clips that complete the circuit. If these are worn or filthy, the battery might not be able to receive power. The battery also needs to be of the correct size and type. The battery will not fit into the fob if it's too big or too small. replacement key for citroen c3 are sold under many names such as CR2016, and even CR2032. They cannot be interchanged. Read the owner's guide for your particular model or look for a sticker on the fob with the details. Once you have the right battery, you can swap it in a matter of minutes. Most fobs have either a slider or switch or a gap which can be used to open the cover off and replace the old battery. Make sure that the new battery is of the same voltage as the previous one and is correctly inserted. Water damage Even if your key fob survived the wash cycle or a dip in the pool, it isn't good for electronics. It can damage batteries and cause significant damage to the electronic chip inside. There are a few steps you can do to prevent damage. First, it's important to take the battery off and dry out the inside and circuit board as much as you can. You can also use a cotton swab which has been dipped into 90 percent alcohol to clean the battery and circuit board. After you've cleaned your key fob, wait a few days for it to completely dry out. You can speed up the process by placing it on a high shelf that won't be disturbed. After you've confirmed that it's dry, try putting in a brand new battery and running it in the same way as you normally would. If your key fob not working, it could be that the receiver module in your car is defective and is unable to transmit signals. It's expensive to fix, but is worth it if you don't need to replace your vehicle. The easiest method to fix a broken key fob is to change the battery. Change the battery will restore the radio signal and make the key fob work once more. If the issue persists and you are unable to resolve it, you should seek professional help. Faulty receiver module In certain situations the key fob's receiver module could have a problem that stops it from receiving and transmitting the proper signal. If this is the situation, your car will not recognize your remote control key, and will not allow you to unlock or start the engine. In this instance the replacement remote control is required. The steps to reprogram the key fob differs based on model and manufacturer therefore, you should consult the owner's manual prior to trying to do it yourself. First, ensure that the battery in the key fob is in good working order and that all buttons are working. You should also close the doors and remove any accessories like alarm systems or radios from the vehicle. You can also clean the chip by using isopropyl or electronic cleaner. If the chip is fried, it will probably need to be replaced. After you've cleaned the key fob, you can remove its circuit board. Clean the contacts with alcohol swabs, and let them dry. When the contacts are dry, you can reassemble the key fob and test it. If the key fob still doesn't work, it might be necessary to replace the battery. Make sure you choose the latest battery that has the same voltage as the previous one. Double-check the battery's placement, as the contact points of the battery are very sensitive. A malfunctioning keyless entry system It can be frustrating if the key fob stops working. The good news is that, most times it's a breeze to get it back up and running. The most common cause of a malfunctioning key fob is a dead coin battery which can be replaced in minutes. Other causes include signal interference, a bad receiver module and other electrical issues. The first thing to do is to ensure that the battery has the correct voltage and has been correctly installed. The correct battery type is also essential. Using an incorrectly sized or polarized one could cause damage to the internal circuitry. Check the fuses for damage or if they have been melted. A transponder inside the key may be damaged or missing. This issue will require further diagnostics by a dealer in the car or professional mechanic. A lot of auto locksmiths and dealerships can reprogram the fob of your car's keys at a cost, but it can be costly. It may be worth it to reprogram your spare fob, if you have one. The instructions are usually found in the owner's manual. If you do not have the manual, you can find instructions online or on YouTube. It is essential to read the owner's manual prior to making any repairs on the key fob.