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Citroen C3 Key Fob Replacement If your C3 key fob suddenly stopped working, it could be because of an inoperative module. If the key fob remains functional, the issue could be due to something else, like water damage or a dead battery for the coin. The eC3 is aiming at the mass market and hence Citroen has been working to make service easy for customers. It offers several features including virtual remote diagnosis and an app that is specifically designed for customer service. Dead coin battery If the key fob's unlock button doesn't working, there is a problem with the battery of the coin. Battery life should be between three and four years with regular use. However, it is possible that it will abruptly die. lost citroen car keys have designed fail-safes which allow you to lock and start the vehicle even if the key fob is dead. The battery inside a key fob is usually secured by metal retaining clips that complete the circuit. The battery may not be powered if these clips are dirty or worn. The battery must also be of the correct size and type. The battery will not fit into the fob if it's too big or too small. Key fob batteries are commonly sold under different names, such as CR2016 and CR2032 (though they aren't interchangeable). The best way to determine what type you should buy is to check the owner's manual or look at the fob to find the sticker with a label that contains the specific details. Once you've found the correct battery, it can be replaced in a matter of seconds. Most fobs come with a slider, switch, or gap that can be used to pry open the cover and exchange the original battery for an alternative. Make sure the new battery is the same size and voltage, and that it is placed in the correct way. Water damage Water is bad for electronics even if they've been through a wash cycle or a dip. It can damage batteries and cause significant damage to the electronic chip inside. Fortunately, there are things you can do to minimize the damage. First, you must get rid of the battery and dry the interior and circuit board as much as possible. You can also make use of a cotton swab, that has been dipped in 90 percent isopropyl alcohol to clean the battery and circuit board. After you've cleaned the key fob, you should wait for a few days to completely dry. You can accelerate the process by placing it on a shelf that isn't disturbed. When you're sure the battery is dry, replace it with a new one and use it in the same way as before. If your key fob still not working it could be because the receiver module in your car is faulty and cannot transmit signals. It's expensive to fix, but it's definitely worth trying if you want to avoid the expense of a replacement. The most effective solution to fix a broken key fob, is to replace the battery. Changing the battery should restore the radio signal and make the key fob to work as it should. If the problem persists you should seek assistance from a professional. Faulty receiver module In certain cases an issue with the receiver module of the key fob may cause it to stop receiving or transmitting proper signals. If this is the case, your car won't recognize the remote control key and will not unlock or start the engine. In this instance you'll need a new one. The steps for reprogramming a key fob vary by make and model therefore, you should consult the owner's manual prior to trying to do it yourself. Make sure that the battery of the key fob is in good working order and that all buttons work. Also, shut the doors and disconnect any additional devices such as alarm systems or radios from the vehicle. You can also clean the chip by using isopropyl or electronic cleaner. If the chip has been damaged, you'll have to replace it. After cleaning the key fob, you can remove the circuit board. Then, clean the contacts with alcohol swabs, and let them dry. After the contacts are dry, you can reassemble and test the key fob. If it doesn't work, you may need to replace the battery. Choose a replacement battery that has the same voltage level as the old battery. It's recommended to make sure the battery is placed in the correct position, as the contact points are very sensitive. Keyless entry system malfunctions It can be quite frustrating If the key fob ceases working. It's typically easy to get your key fob running. A dead battery in the coin slot is the most common reason for a fob that is malfunctioning. It can be replaced within minutes. Other reasons include signal interference, the receiver module is defective or other electrical issues. The first step is to make sure that the battery is of the correct voltage and that it is properly put in. It is also essential to select the correct battery type. Using an incorrectly sized or polarized battery could damage the internal circuitry. Also, you should check the fuses to make sure they are not blown or melted. The transponder within the key may be damaged or missing. This is a scenario that will require further diagnostics by a car dealer or professional mechanic. Auto locksmiths and dealers can reprogram the key fob of a vehicle for a fee. However this can be expensive. It might be worth it to reprogram your spare fob, if you have one. It is possible to find instructions in the owner's manual. If you do not have the manual, you can find the instructions online or on YouTube. It is imperative to check the owner's manual prior to making any repairs on the key fob.