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Citroen C3 Key Fob TroubleshootingCitroen key fobs may not function due to a variety of reasons. Some of them include worn buttons and poor contact with the battery, water damage and receiver module problems. Check the 12 volt batteries.If your key fob does not unlock your car, it could be experiencing deprogramming. This occurs when certain buttons send an alert to the computer onboard to remove the key from its list of access.Dead coin batteryIf your Citroen C3's key fob isn't working, the first thing to examine is whether the battery is dead. The batteries that are in the fobs are small, round coins that can be replaced within a few moments. You can find these at the general stores, home improvement stores, and even auto parts stores. Make sure you purchase the right type. For fobs, batteries are typically CR2025 or CR2032 However you must consult the owner's manual of your vehicle to determine what type is required.Before you replace the battery, take off the button pad and rub it with alcohol and cotton swabs. This will remove any corrosion, and clean the contacts that typically have a gold color. Once the contacts have been cleaned then you can put in the new battery. Be careful not to mix the two kinds as they differ in voltage, sizes and diameters.The next step is to check the voltage of the battery. You can get a reliable reading using a multimeter which is calibrated to the battery's voltage range. If the battery is at the value that is either above or below its threshold, it has to be replaced. The Keylab may also try getting your car started using a spare key, however this might not work in all situations. If the problem persists visit a CITROEN dealership with your V5 registration and personal identity documents. A CITROEN Dealer can obtain the code of your vehicle's immobiliser and order a new battery.Water damageIf the key fob falls under water, it could lose its signal to the car. If this occurs, it's a good idea to remove it from the pool, puddle or washing machine as soon as possible. Once you've done that, use a cotton swab and isopropyl or electronic cleaner to dry the circuit board. If the circuit board is still not working it could be time for a new key fob.Signal interference is a different cause of Citroen remote control not working. This can happen when there is an electrical field close to the vehicle or other transmitters that operate on the same frequency. Once you leave the interference area, your key fob will start working again.The Citroen C3 key fob may be inoperable due to worn buttons signals, signal interference issues receiver module problems or a dead battery, or a defective chip. It will need to be changed to a new program in the event of this. This can be done by a certified mechanic or at an Citroen dealership. If the problem is serious it may be necessary to replace it. This is a simple and affordable fix, but it's important to act quickly. The longer you delay fixing the issue, the more difficult it gets. It could pose a risk to passengers and yourself if the problem is not resolved.Receiver module issueIf your key fob is not working it could be because the receiver module might have developed a fault. Water damage is among the numerous reasons. It can happen when you drop your keys or wash them. You can try to solve the issue by removing and cleaning the chip with isopropyl alcohol or an electronic cleaner. This will help to keep the chip from getting damaged.You can also reset the receiver module by disconnecting it from the car battery, and waiting for 10 seconds. Then, reconnect the battery to the car and repeat the procedure. If this does not resolve the problem, you can take it to a dealer to have it replaced.Interference can also cause your key to stop working. It can be caused by other transmitters that operate on the same frequency or objects inside your vehicle. If you are unable to fix the issue, you can take your key fob in to an authorized dealer and have it reset.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 is not accurate the receiver will not recognize the car key and display a message telling you "key not recognized". This can be a frustrating problem, especially when you're trying to start your car.Dead 12 volt batteryIf your key fob stops working after a battery change the device could be damaged. This is especially true if the key fob was dropped or stepped on, but it can also happen after service on your car that requires removal and reinstallation of panels. When the panels are removed, wires are exposed. If your fob has been damaged, it may need to be replaced entirely.Another possibility is that the remote is getting interference from other devices or places. This can cause RF signals to become weak and prevent the car from being able to recognize the remote. If this happens you can reset the computer systems on board by disconnecting the 12 volt battery for approximately 15 minutes. This will eliminate any remaining electric current, allowing your system to restart.It is essential to confirm the size and type of the battery before replacing it. The circuit board inside the fob's circuit board could be damaged when the battery you replace is too large or has a different voltage. Also, you should clean any corrosive materials off the chip in the fob prior to installing the new battery. Using the correct type of battery will ensure that it is properly sealed and protected from moisture. Once the key fob is been installed, it should work normally. In the majority of cases, you can use the second key to start your car when it displays the message "key is not detected." It could be necessary to press the button several times before it responds.