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Citroen C3 Key Fob TroubleshootingCitroen c3 key fob can stop working for different reasons. Some of them include worn buttons or poor contact with the battery, water damage and receiver module problems. You should also check the 12 volt battery.If your key fob does not unlock your car, you may be experiencing deprogramming. This happens when certain button combinations send an electronic message to the computer, asking that the key be removed from its list of keys.Dead coin batteryIf the fob that you use to open the door on your Citroen C3 is no longer functioning, first check if the battery has died. The batteries inside the fobs are small round coins that can be replaced in just a few minutes. They are sold in general stores, home improvement stores and auto parts stores. Make sure you purchase the correct model, however. Batteries for fobs are typically CR2025 or CR2032, however you should refer to the owner's manual for your vehicle to determine what kind of battery is needed.Before replacing the battery, take off the button pad and rub it with cotton swabs or alcohol. They will remove the corrosion and clean the contacts that are usually gold colored. After cleaning the contacts and sanitized, you can then insert the new battery. Be careful not to mix up the two types since they differ in voltage, dimensions, and shapes.The next step is to assess 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 has an amount that is above or below its threshold, it is required to be replaced. You could also try to start your car using an additional key, however it may not be successful in all instances. If thekeylab.co.uk continues, go to an CITROEN dealership with your V5 registration and identification documents. A CITROEN dealer can locate the code for your vehicle's immobiliser system, and get the replacement battery.Water damageWhen the key fob goes under water, it could lose its signal to the car. It's best to remove it as soon as you can out of the pool or puddle. Once you do, dry out the circuit board as well as you can using the help of a cotton swab, dipped into isopropyl alcohol, or electronic cleaner. If it's still not working then it's time to get a new key fob.Another reason that can be cited the most common reason for Citroen remote control c3 not working is signal interference. It can happen when there is an electrical field near the vehicle or other transmitters using the same frequency. The key fob should begin to function again after you have left the area of interference.The Citroen C3 key fob can stop working because of worn buttons, signal interference issues, receiver module problems as well as a dead 12-volt battery, or a defective chip. You'll have to get it reset in the event of this. This can be accomplished by a qualified mechanic or at a Citroen dealership. If the issue is severe the vehicle will need to be it replaced. It's a relatively easy and inexpensive fix. However, you need to be quick to act. The longer you delay to resolve the issue, the more deteriorated it becomes. If the issue doesn't get resolved, it can be dangerous for you and your passengers.Receiver Module IssueIf your key fob isn't working it could be because the receiver module might have developed an issue. Water damage is among the numerous reasons. This can happen if drop your keys or wash them. You can resolve the issue by removing and cleaning the chip using isopropyl alcohol or electronic cleaner. This will help to stop the chip from corroding.You can also reset the receiver module when you disconnect it from the battery for 10 seconds. Then, reconnect the battery to the car and repeat the procedure. If this doesn't fix the problem, you can take it to a dealership to be repaired.Interference can cause your key to stop working. This can be caused either by other transmitters using the same frequency or objects inside your vehicle. If you are unable solve the issue, take your key fob to a dealer and have it replaced.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 detected". This can be a frustrating problem, especially when trying to start your car.Dead 12 volt batteryIt is possible that your key fob may have been damaged if it ceases to function after a change in batteries. This is more frequent when your key fob has been dropped or stepped upon However, it can occur following a repair that requires the removal of the panels and reinstallation. Wires are exposed when these panels are removed. If your fob is damaged, you may need to replace it completely.Another possibility is that the fob is receiving interference from other devices or locations. This can cause RF signals to weaken and block the car from being able to recognize the remote. If this happens you can reset all on-board computers by disconnecting the 12 volt battery for approximately 15 minutes. This will remove any residual power, allowing the system to reboot.Before replacing the battery it's important to make sure it is the correct size and type. If the battery you replace is too small or has an incompatible voltage, it could harm the circuit board inside the fob's key. Also, you should clean any corrosive materials off the chip inside the fob before installing the new battery. The correct type of battery can ensure that the key fob is sealed and shielded from moisture. Once the key fob is put back in place, it should function normally. It is usually possible to use the second key even in the event that your vehicle displays a message that reads "key is not recognized." It might be necessary to press the button several times before it responds.