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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can stop working for many reasons. Some of them include worn buttons, poor contact with the battery, water damage and receiver module issues. Also, you should check the 12 volt battery. If the key fob does not unlock your car, it could be experiencing deprogramming. This occurs when certain button combinations send an electronic message to the computer requesting that the key be removed from its list of keys. Dead coin battery If the key fob on your Citroen C3 is no longer functioning, first check if the battery has gone out. Fobs have small coins-shaped batteries that can be replaced in a few minutes. They are available at home improvement stores, and even auto parts stores. Be sure to purchase the correct battery, however. For fobs, batteries are typically CR2025 or CR2032 However you should refer to the owner's manual of your vehicle to determine what type is required. Before you replace the battery, remove the button pad and rub it with cotton swabs or alcohol. This will remove any corrosion, and clean the contacts which typically have a gold color. After the contacts have been cleaned, you can insert the new battery. Be careful not to mix the two batteries because they have different diameters and voltages. The next step is to determine the voltage of the battery. A multimeter calibrated to the battery's voltage range will give you a reliable reading. If the battery is at a value above or below its threshold, it is required to be replaced. You may also be able to start your car with a spare keys. However, this might not always work. If the issue persists, go to a CITROEN dealership with your V5 registration and identification documents. A CITROEN Dealer can locate the code of your vehicle's immobiliser and order an upgrade to your battery. Water damage If the key fob is submerged it could lose its signal. It is recommended to remove it as soon as possible out of the pool or puddle. After this using a cotton swab, isopropyl or electronic cleaner to dry the circuit board. If the key fob doesn't function, it might be time to invest in a new one. Signal interference is another frequent cause of Citroen remote control not working. This could happen when there is a strong electrical field that is close to the vehicle, or from other transmitters on the same frequency. The key fob should begin working once you have left the area of interference. Additionally, the Citroen C3 key fob could be inoperable due to worn buttons, signal interference, receiver module issues or a dead 12 Volt battery, or a damaged electronic chip. You'll need it reprogrammed if this happens. This can be done either by a qualified mechanic, or a Citroen dealer. If the issue is significant the vehicle will need to be it replaced. It's a simple and affordable fix, but it's crucial to act fast. The longer you delay fixing the issue, the worse it becomes. It could be hazardous to you and your passengers If the issue isn't solved. Receiver Module Issue If your key fob stops working, it could be due to the receiver module having developed an issue. This can be caused by a number of things, including water damage. This can happen if you lose your keys, or wash them. It is possible to fix the problem by removing and cleaning the chip with isopropyl alcohol or electronic cleaner. This will prevent corrosion of the chip. You can also try to reset the receiver module by disconnecting it from the car battery and letting it sit for 10 seconds. Then, reconnect the battery to the car and repeat the procedure. If citroen car key replacement does not resolve the issue, you can take it to a dealership to be repaired. Another reason your key may not work is due to interference. It could be caused by other transmitters operating on the same frequency or by objects in your vehicle. If you're not able to fix the problem, you can go to a dealership to have 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 accurate it will not recognize the car key and display a message stating “key not detected”. This could be a very frustrating problem, especially when you're trying to start your vehicle. Dead 12 volt battery If your key fob stops working after the battery has been changed the device could be damaged. This is more common when your key fob has been dropped or stepped upon however, it can also happen after a service that requires the removal of panels and the reinstallation. When these panels are removed, the wires are exposed. If your fob is damaged, you might have to replace it completely. Another possibility is that the fob is getting interference from other devices or locations. This can make RF signals less effective and hinder the car from being able to recognize the remote. You can reset your on-board computer in this situation by disconnecting the 12-volt battery for 15 minutes. This will eliminate any remaining electricity, allowing the system to restart. Before replacing the battery it is essential to ensure that it's the right size and type. The circuit board in the fob's circuit board could be damaged when the replacement battery is too large or has a different voltage. Also, you should clean any corrosive material from the chip inside the fob prior to installing a new battery. Using the correct type of battery can help ensure that it is properly sealed and protected from moisture. Once the key fob's been installed, it should work normally. It is possible to use the second key even the car displays a message that says “key not found.” It is possible to press the button several times before it responds.