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Citroen C3 Key Fob Replacement If your C3's key fob stopped functioning suddenly it could be due to a malfunctioning receiver module. If the key fob functions it could be due to something else like water damage or a dead battery. The eC3 is targeting the mass market and hence Citroen has focused on making service easy for customers. It offers several features including virtual remote diagnosis as well as a dedicated app for customer service. Dead coin battery If the key fob's unlock function isn't working, there is a problem with the coin battery. The battery should last between three and four years with regular usage, but it can die suddenly. Luckily, car makers have built-in fail-safes that ensure you can lock and start your vehicle even if your key fob is dead battery. The battery in the key fob is normally held in place by metallic clips that form the circuit. If they're worn or dirty, the battery will not be able to receive electricity. 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. G28 Car Keys for key fobs are sold under many names such as CR2016, and even CR2032. They are not interchangeable. Refer to the owner's manual for your model or look for a label on the fob with the details. If you've found the right battery you can replace it in just a few moments. The majority of fobs have the option of a slider, switch or a gap that can be used to open the cover and replace the old battery. Ensure that the new battery has the same voltage as the previous one and is properly inserted. Water damage Even if your key fob survived the wash cycle or an immersion in the pool, water is not suitable for electronics. It can damage the chip and damage the battery. Fortunately, there are options to minimize the damage. It is important to first take out the battery and then dry out the interior as possible. You can also clean the battery using a cotton swab that has been dipped into 90-percent alcohol. After you have cleaned the key fob, you must let it dry for a few days. You can speed up the process by placing it on a shelf that won't be disturbed. Once you are sure that the battery is dry, replace it with another battery and use it as normal. If your key fob still not working it could be because the receiver module in your car is defective and isn't able to transmit signals. It can be expensive to repair, but worth it if you don't need to replace your car. The simplest way to fix a damaged key fob is to change the battery. The battery change will restore the radio signal and make your key fob work again. If the problem continues, you should seek professional assistance. The receiver module is not working properly. In some cases an issue with the receiver module of the key fob can hinder it from receiving or transmitting the correct signals. If this is the situation, your car will not recognize the remote control key and will not unlock or start the engine. In this case you'll have to purchase an alternative. Refer to the owner's manual prior to trying to modify the key fob by yourself. First, check that the battery of the key fob is in good working order and that all of its buttons are functioning. Close the doors and take out any aftermarket devices such as alarms or radios from your vehicle. You can also clean the chip using isopropyl or electronic cleaner. If the chip has become fried, you will need to replace it. After you've cleaned your key fob, take it off its circuit board. Then apply alcohol swabs clean the contacts and let them dry in the air. When the contacts are dry you can put them back together key fob and test it. If the key fob still doesn't work, it might be required to replace the battery. Make sure to use a new battery that provides the same voltage as the previous one. It's recommended to ensure that the battery is in place in the first place, since the contact points are extremely sensitive. Faulty keyless entry system The key fob is a great convenience for cars, but it can be frustrating when it stops working. The positive side is that most times, it's easy to get it back up and running. A dead coin battery is the most frequent cause of a malfunctioning fob. This can be easily replaced in a matter of minutes. Other causes include signal interference, malfunctioning receiver modules or other electrical issues. The first step is to ensure that the battery is properly fitted and has the correct voltage. The correct type of battery is also vital. The internal circuitry of the device may be damaged by using batteries that are not the correct size or one that is not polarized. Examine the fuses to determine if they are damaged or if they have been melted. A transponder that is inside the key could be damaged or gone. This will require a further investigation by a qualified mechanic or dealer in cars. Auto locksmiths and dealers will reprogram the key fobs of the vehicle for a fee. However this can be expensive. It could be worthwhile to reprogram your spare fob if you own one. In most cases, you can locate the steps in the owner's manual. If you don't own the manual, you can locate instructions online or on YouTube. It is imperative to check the owner's manual prior attempting any repairs to the key fob.