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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can malfunction due to a number of causes. They can be due to worn buttons, poor contact between the battery and the water and receiver module problems. You should also check the 12 volt battery. If the key fob will not unlock your car, you may be experiencing deprogramming. This happens when certain button combinations send an email to the onboard computer asking that the key be removed from its list of keys. Dead coin battery If your Citroen C3's key fob has stopped working the first thing to check is if the battery is dead. The batteries inside the fobs are small round coins that can be easily replaced in a matter of minutes. They are available at home improvement stores, and even auto parts stores. Make sure you purchase the correct battery, however. Batteries for fobs are usually CR2025 or CR2032, however you should check the owner's manual of your vehicle to determine which type is required. Remove the button pad and then use cotton swabs or alcohol to clean it. These will help remove corrosion and clean the contacts which are usually colored gold. Once the contacts have been cleaned and sanitized, you can then insert the new battery. Be careful not to mix the two types as they differ in their voltages and diameters. The next step is to test the battery's current voltage. A multimeter calibrated to the battery's voltage range will give you an accurate reading. If the battery's current value is either above or below the threshold, it needs to be replaced. You can also start your vehicle using a spare key. However, this might not always work. If the problem persists go to a CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN Dealer can obtain the code for your vehicle's immobiliser and can order an upgrade to your battery. Water damage If the key fob is 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've done that, use an swab of cotton and isopropyl or electronic cleaner to clean the circuit board. If it's still not working then it's time to get a new key fob. citroen c3 keys is another frequent reason for Citroen remote controls not working. This could happen when there is an intense electrical field near the vehicle or from other transmitters on the same frequency. The key fob should start working again after you have left the area of interference. The Citroen C3 key fob could cease to function due to worn buttons or signal interference, receiver module issues and a dead 12 volt battery, or a malfunctioning electronic chip. If this happens, then you'll have to have it reset by a professional. This can be done by a skilled mechanic or at an Citroen dealership. If the issue is significant the vehicle will need to be it replaced. It's a fairly simple and inexpensive fix. But you must get it done quickly. The longer you wait to correct the issue the more deteriorated it becomes. It could be hazardous to passengers and you in the event that the issue isn't addressed. Issue with the Receiver module If your key fob ceases functioning, it could be because the receiver module has developed a fault. Water damage is among the many reasons. This can happen when you drop your keys, or wash them. You can try to fix the issue by taking off and cleaning the chip using isopropyl alcohol or electronic cleaner. This will stop the chip from corrosion. You can also reset the receiver module by disconnecting it from the car battery and then waiting for 10 seconds. Then, reconnect the battery and repeat the process. If this does not fix the problem, you can take it to a retailer for replacement. Interference can cause your key to stop working. This could be caused by other transmitters that use the same frequency as your key fob, or even objects in your vehicle. If you're unable fix the issue, go to a dealership to get your key fob reprogrammed. 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 correct the receiver module will not recognize the key and will display an error message that states the key is not detected. This can be a frustrating issue, especially when trying to start your car. Dead 12 volt battery It is possible that your key fob may have been damaged if it ceases to function after a change of batteries. This is particularly true when the key fob is dropped or stepped on. However, it could also occur following servicing on your car that requires removal and reinstallation of the panels. When these panels are removed, the wires are exposed. If your fob was damaged, it may require replacement. Another possibility is that the fob is receiving interference from other devices or places. This can cause RF signals to become weak and prevent the car from understanding the remote. You can reset the onboard computer in this situation, by disconnecting the 12-volt battery for 15 minutes. This will eliminate any remaining electrical energy, allowing the system to restart. It is essential to confirm the size and quality of the battery before replacing it. The circuit board in the fob's key can become damaged when the battery you replace is too large or has a different voltage. You should also clean any corrosive material from the chip inside the fob prior to installing a new battery. The right battery type can ensure that the key fob is properly sealed and protected from moisture. After the key fob has been replaced, it should work normally. You should be able to use the second key even the car displays a message stating “key not found.” It may be necessary to press the button several times before it responds.