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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can cease to function due to a number of reasons. This includes worn buttons, poor contact between the battery and the water and receiver module issues. Check the 12 volt batteries. Deprogramming may be the cause the key fob's inability to unlocking your car. This occurs when certain button actions send an instruction to the computer onboard to remove the key from its list of access. Dead coin battery If the fob that you use to open the door on your Citroen C3 is no longer working, check first if the battery has failed. Fobs use small coins-shaped batteries that can be replaced in a few minutes. You can find these at home improvement stores, and a few auto parts stores. Make sure you buy the correct battery, however. For fobs, batteries are typically CR2025 or CR2032, however, you should consult the owner's manual for your vehicle to determine what kind of battery is needed. Before you replace the battery, take off the button pad and rub it with cotton swabs or alcohol. These will help remove corrosion, and clean the contacts, which typically have a gold color. After the contacts have been cleaned, you can then install the new battery. Be careful not to mix up the two types since they have different voltages, dimensions and shapes. The next step is to assess the voltage of the battery. You can obtain a precise reading using a multimeter, which is set to the battery voltage range. If the battery is at a voltage that is higher or lower than its threshold, it has to be replaced. You can also try starting your car with a spare key, however it may not work in all cases. If the problem persists you should visit a CITROEN dealer with your V5 registration form and personal identification documents. A CITROEN Dealer can locate the code of your vehicle's immobiliser and can order a new battery. Water damage If the key fob is submerged, it may lose its signal. It's best to remove it as soon as you can from the pool or puddle. After you've done this make use of an swab of cotton and isopropyl or electronic cleaner to dry the circuit board. If it still doesn't work It could be the right time to purchase a new key fob. Signal interference is another common reason for Citroen remote control not working. This may occur when there is a strong electrical field near the car or from other transmitters on the same frequency. The key fob should start working again after you have left the zone of interference. Additionally, the Citroen c3 key fob can cease to function due to worn buttons signals, signal interference, receiver module issues or a dead 12 volt battery, or a defective electronic chip. If this happens, you'll likely have to have it changed by a certified expert. This can be done either by a qualified mechanic or a Citroen dealer. If the issue is significant it may be necessary to replace the device. This is a simple and inexpensive fix, but it's essential to act quickly. The longer you put off fixing the problem, the worse it becomes. It could be dangerous for passengers and you in the event that the issue isn't resolved. Receiver module issue If your key fob is not functioning, the receiver module may have developed a fault. This can be caused by various factors such as water damage. This can happen when you drop your keys or wash them. You can try to resolve the issue by removing and cleaning the chip using isopropyl alcohol or electronic cleaner. This will help to avoid the chip from becoming damaged. You can also reset the receiver module by disconnecting it from the car battery and letting it sit for 10 minutes. You can then reconnect the battery and repeat the process. If this fails to fix the issue, go to a dealer to have it replaced. Interference can cause your key to stop working. This can be caused by other transmitters that utilize the same frequency as your key fob or by objects within your vehicle. If you are unable to fix the issue, you can take your key fob to a dealer to be changed to a different frequency. 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 the receiver won't recognize the car key and display a message stating “key not recognized”. This could be a frustrating problem, especially when you're trying to start your car. Dead 12 volt battery If your key fob ceases working after the battery has been changed It could be damaged. This is more frequent when the key fob been dropped or stepped over, but can also happen after a service that requires the removal of the panels and reinstallation. Wires are exposed when these panels are removed. If your fob is damaged, it may need to be replaced entirely. A fob that is receiving interference from other devices and locations is also a possibility. citroen replacement key cost can make the RF signals weaker and block the car from recognizing the remote. You can reset your on-board computer in this situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will remove any remaining power and let the system start from scratch. It is important to check the size and quality of the battery before replacing it. If the battery you replace isn't big enough or has different voltage, it could harm the circuit board inside the key fob. It is also recommended to clean any corrosive substances from the chip inside the fob prior to installing a new battery. The right battery type can ensure that the key fob is sealed and protected from moisture. After the key fob has been reinstalled, it should work normal. In the majority of cases, you can use the second key to start your car in the event that it displays a message saying “key not detected.” You may have to press the button several times before it responds.