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Citroen C3 Key Fob ReplacementIf the key fob on your C3 stopped working all of a sudden it could be due to a malfunctioning receiver module. If the key fob works it could be due to something else, like water damage or a dead battery.The eC3 is going after the mass market, and Citroen has focused on making service easy for customers. It comes with a variety of features, including virtual remote diagnosis and an app that is specifically designed for customer service.citroen key TheKeyLabIf the key fob's unlock button doesn't working, there may be an issue with the coin battery. The battery's lifespan should be between three and four years with regular usage. However, it could suddenly die. Luckily, car makers have built-in fail-safes so that you can start and lock your car even if your key fob is dead battery.The battery in a key fob is usually secured by metal retaining clips that complete the circuit. The battery may not be powered if the clips are worn or dirty. The battery must be the correct size and type. The battery will not fit into the fob if it is too big or too small.Key fob batteries are often sold under different names, including CR2016 and CR2032 (though they're not interchangeable). The best way to know what type you should buy is to refer to your owner's manual, or examine the fob for the label which provides you with the precise details.Once you have the correct battery, you can swap it in a few minutes. Most fobs include a slider, a switch or a gap which can be used to pry the cover open to replace the battery that was used. Make sure the new battery is the same voltage and is inserted in the correct position.Water damageEven even if your key-fob has survived the wash cycle or taking a dip in the pool, water is not good for electronics. It can damage batteries and cause significant damage to the electronic chip inside. Fortunately, there are some actions you can take to minimize the damage.It's important to first remove the battery, and then dry out the interior as possible. You can also make use of a cotton swab, dipped in 90-percent isopropyl alcohol to clean the battery and circuit board.After you've cleaned the key fob, wait several days for it to completely dry out. You can accelerate the process by placing it on a high shelf where it will not be disturbed. Once you're certain that the battery is totally dry, insert another battery and use it as normal.If your key fob is not working it could be because the receiver module in your car is damaged and is unable to transmit signals. It's costly to repair, but it's worth it if your goal isn't to replace your car.The simplest way to fix a broken key fob is to change the battery. The battery change will bring back the radio signal and make the key fob work again. If the problem continues, you should seek assistance from a professional.Faulty receiver moduleIn certain cases there are instances where a flaw in the receiver module of the key fob can stop it from receiving or transmitting the right signals. If this is the case, your car won't recognize your remote control key, and will not be able to unlock or start the engine. In this instance, you'll need to get a replacement.The steps needed to reprogram keys differ based on model and brand therefore, you should consult the owner's manual before trying to do it yourself. Make sure the battery of the key fob is in good health and that all buttons work. You should also close the doors and disconnect any aftermarket devices like alarm systems or radios from the vehicle.You may also try cleaning the chip with isopropyl Alcohol or electronic cleaner. If the chip is damaged it is likely to be replaced.After cleaning the key fob, take it off the circuit board. Then, clean the contacts using alcohol swabs. Let them dry. After the contacts are dry, you can put them back together and test the key fob. If the key fob still doesn't work, then it might be necessary to replace the battery. Be sure to choose an alternative battery that is able to provide the same voltage as your old one. Verify the battery's position because the contact points are extremely sensitive.Keyless entry systems with malfunctionsThe key fob is an excellent convenience in cars but it can also be frustrating when it ceases to function. The positive side is that most of the time, it's easy to get it working again. The most common cause of a malfunctioning key fob is a dead coin battery, which can be replaced within minutes. Other causes include signal interference or a defective module, as well as other electrical problems.The first thing to do is to make sure that the battery is running at the right voltage and is correctly placed. The correct battery type is also vital. If you use a wrongly sized or polarized battery can damage the internal circuitry. Check the fuses for damage or if they have been melted.Another possible problem is that the transponder within the key could have been damaged or destroyed. This problem will require an investigation by a professional mechanic or a dealer for cars.A lot of auto locksmiths and dealerships can reprogram the fob of your car's keys for a fee, but this can be expensive. It might be worth it to reprogram your spare fob if you own one. In the majority of cases, you will find instructions in the owner's manual. If you don't have the manual you can look up instructions online or on YouTube. Before you attempt to repair the key fob, it's vital to refer to the owner's manual.