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Citroen C3 Key Fob Replacement If your C3's key fob stops suddenly it could be due to a faulty receiver module. If the key fob is working, it could be due to another issue, such as water damage or a dead battery. The eC3 is targeting the mass market, and Citroen has worked on making service easy for customers. It comes with a variety of features, including virtual remote diagnosis as well as an app specifically for customer service. Dead coin battery If the unlock button on the key fob does not work, it could mean that the battery in the coin is not working properly. The battery should last between three and four years with regular use however, it could die unexpectedly. Luckily, car makers have built-in fail-safes to ensure that you are able to lock and start your vehicle even if your key fob is dead battery. The battery inside the key fob is held in place by clips made of metal that form the circuit. If the clips are worn or dirty, the battery might not be able to receive the power. The battery also needs to be the right size and type. The battery won't fit in the fob if it is too large or too small. Batteries for key fobs are sold under various names, including CR2016 and even CR2032. These batteries are not interchangeable. The best way to know which one to buy is to consult the manual of your owner or look over the fob for the sticker with a label that gives you the specific details. Once you've found the correct battery that you want to replace, it can be done in just a few moments. Most fobs come with a slider, a switch or a gap which can be used to pry the cover open and replace the old battery. Be sure that the new battery has the same voltage as the older one and is inserted correctly. Water damage Water is bad for electronics even if they've survived the wash cycle or a dip. It can damage the battery and cause severe damage to the electronic chip inside. There are some things that you can do to minimize damage. It is important to first take out the battery and then dry the inside as possible. You can also make use of a cotton swab that has been coated in 90 percent isopropyl ethanol to cleanse the battery and circuit board. After cleaning the key fob you need to let it dry for a few days. You can accelerate the process by placing it on a high shelf where it will not be disturbed. Once you're sure that it's dry, put in a new battery and using it as normal. If your key fob still not working it could be because the receiver module in your car is faulty and cannot transmit signals. It can be expensive to fix, but is worth it if your goal isn't to replace your car. The simplest solution to fix a broken key fob is to replace the battery. The battery change will restore the radio signal and make the key fob to work as it should. If the issue persists, you should seek assistance from a professional. Receiver module that is defective In some cases an issue with the receiver module of the key fob may cause it to stop receiving or transmitting the right signals. In this situation the car won't recognize the remote control key. It will not unlock or start. In this instance the replacement remote control will be needed. Refer to the owner's manual prior to attempting to program the key fob yourself. First, ensure that the battery on the key fob is in good shape and that all buttons are working. Also, close the doors and disconnect any aftermarket devices like radios or alarm systems from the vehicle. You can also clean the chip using isopropyl or electronic cleaner. If the chip is fried, you will need to replace it. After cleaning the key fob, remove the circuit board. Then, clean the contacts using alcohol swabs and allow them to dry. After the contacts have dried you can reassemble your key fob and test it. If it's not working it may be necessary to replace the battery. Make sure you choose the latest battery that has the same voltage as the previous one. It's recommended to check that the battery is placed in the correct position, as the contact points are extremely sensitive. Keyless entry systems that fail It can be very frustrating if the key fob stops working. The good news is that, most of the time, it's easy to get it working again. A dead battery for the coin is the most common reason for a broken fob. It can be replaced within minutes. Other causes include signal interference the receiver module is defective or other electrical issues. The first step is to ensure that the battery is correctly fitted and has the correct voltage. The correct type of battery is also vital. The internal circuitry of the device could be damaged by using the wrong battery, or one that isn't the proper size or the correct polarized. Check the fuses for damage or if they have been melted. Another possibility is that the transponder contained in the key may have been damaged or gone missing. This issue will require an examination by a professional mechanic or car dealer. Many auto locksmiths and dealerships can reprogram a car's key fob for a small fee, but this can be costly. If you have a spare, it could be worthwhile to try reprogramming the fob yourself. In G28 , you'll find the instructions in your owner's guide. If you don't have the manual, you can find instructions online or on YouTube. Before attempting to fix the key fob, it's vital to refer to the owner's guide.