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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can stop working due to many reasons. They can be due to worn buttons, poor battery contact, water damage and issues with the receiver module. You should also check the 12 volt battery. Deprogramming is a possible cause of your key fob not unlocking your car. This happens when certain button sequences send an alert to the onboard computer to remove the key from its list of access. Dead coin battery If the key fob on your Citroen C3 is no longer working, check first if the battery has failed. The batteries that are in the fobs are tiny, round coins that can be changed in a matter of seconds. These can be found in general stores, home improvements stores, and auto parts stores. Make sure you purchase the right type. Batteries for fobs are typically CR2025 or CR2032, however you must consult the owner's manual for your vehicle to determine what type is required. Before you replace the battery, remove the button pad and rub it with alcohol and cotton swabs. This will help remove corrosion, and clean the contacts, which are typically gold-colored. Once the contacts are cleaned it is time to insert the new battery. Be cautious not to mix the two types since they differ in voltage, dimensions, and shapes. The next step is to determine the voltage of the battery. You can get an accurate reading using a multimeter that is set to the battery's voltage range. If the battery's value is in the middle or above the threshold, then it needs to be replaced. Try starting your car with an additional key, however this might not work in all situations. If the problem persists visit a CITROEN dealership with your V5 registration and identification documents. A CITROEN dealer will be able to retrieve the code for your vehicle's immobiliser and get an alternative battery. Water damage When the key fob gets underwater, it may lose its signal to the car. If this happens, it's a good idea to get it out of the pool, puddle or washing machine as fast as possible. Once you do dry the circuit board as much as you can using a cotton swab dipped in isopropyl ethanol or electronic cleaner. If the key fob still isn't working, it may be time to purchase an additional one. Signal interference is a common cause of Citroen remote controls not working. This can occur when there is a strong electrical field that is close to the car or from other transmitters on the same frequency. When you leave the interference area your key fob will start working again. Finally, the Citroen C3 key fob might stop working due to worn buttons or signal interference, receiver module issues and a dead 12 volt battery, or a defective electronic chip. It will need to be changed to a new program if this happens. This can be accomplished by a qualified mechanic or at a Citroen dealership. If the issue is severe it may be necessary to replace the device. It's a relatively easy and inexpensive fix. But you should act quickly. If you put off fixing the issue, the more difficult it becomes. If the issue isn't fixed the issue could be a hazard for you and your passengers. Receiver Module Issue If your key fob is not functioning the receiver module could have developed a fault. Water damage is one of the numerous reasons. This could happen if you lose your keys or wash them. You can attempt to resolve the issue by removing and cleaning the chip using isopropyl alcohol, or electronic cleaner. This will keep the chip from getting damaged. You could also try to reset the receiver module by disconnecting it from the car battery and then waiting for 10 seconds. Then, reconnect the battery and repeat the procedure. If this doesn't fix the issue, take it to a dealer for replacement. Another reason why your key could stop working is due to interference. It could be caused by other transmitters that utilize the same frequency as your key fob or by objects inside your vehicle. If you're not able to fix the issue, visit a dealer to change the key fob's programming. The key fob contains a short-range radio transmitter/radio-frequency identification (RFID) chip and antenna, which sends a distinct coded signal to the receiver module in your car. If the signal isn't right it will not recognize the car key and display a message stating “key not detected”. This can be a frustrating issue especially when you attempt to start your vehicle. Dead 12 volt battery If your key fob ceases working after changing the battery the device could be damaged. This is more frequent when your key fob has been thrown or stepped on However, it can happen after a service that requires the removal of panels and then reinstallation. When the panels are removed, wires are exposed. If your fob has been damaged, it might need to be replaced entirely. Another possibility is that the remote receives interference from other devices or locations. This can make RF signals weaker and prevent the car's recognition of the remote. If this is the case you can reset all on-board computers by disconnection of the battery at 12 volts for approximately 15 minutes. G28CarKeys will remove any remaining electricity and let the system start from scratch. Before replacing the battery it is important to ensure it is the correct type and size. If the battery you replace is too small or has an incompatible voltage, it could harm the circuit board in the key fob. Also, you should clean any corrosive material from the chip in the fob before installing the new battery. The right battery type can ensure that the key fob is properly sealed and protected from moisture. Once the key fob is been reinstalled, it will function normally. In most instances, you will be able to use the second key to start your car, even if it shows a message saying “key not found.” It may be necessary to press the button a few times before it responds.