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Citroen C3 Key Fob TroubleshootingCitroen c3 key fobs can not function for many reasons. They can be due to worn buttons, poor contact with the battery, water damage and receiver module problems. It is also recommended to check the 12 volt battery.Deprogramming could be the cause the key fob's inability to unlocking your car. 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 failed. Fobs use small, coin-shaped batteries that can be replaced in a few minutes. They can be found in general stores, home improvement stores and auto parts stores. Be sure to buy the right type. The Key Lab require CR2025 or CR2032, but you should look through the owner's guide to determine the exact type of battery that your car requires.Before replacing the battery, remove the button pad and rub it with cotton swabs and alcohol. These will help remove corrosion and clean the contacts, which are typically colored gold. Once the contacts are cleaned, you can insert the new battery. Be careful not to mix the two types because they differ in their voltages and diameters.The next step is to test the battery's voltage. You can obtain a precise reading using a multimeter which is set to the battery voltage range. If the battery's voltage is in the middle or above the threshold, it should be replaced. You can also start your car with a spare keys. However, this might not always work. If the problem persists, visit a CITROEN dealer with your V5 registration form and personal identification documents. A CITROEN dealer can find the code of your vehicle's immobiliser, and then order 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 quickly as possible from the pool or puddle. After this using a cotton swab, isopropyl or electronic cleaner to clean the circuit board. If it still doesn't work then it's time for a new key fob.Signal interference is a common reason for Citroen remote controls not working. It can happen when there is an electrical field close to the car or other transmitters operating on the same frequency. The key fob should start to function again after you are out of the area of interference.The Citroen C3 key fob might cease to function due to worn buttons or signal interference, receiver module issues or a dead 12 volt battery, or a defective electronic chip. You'll need it reprogrammed when this happens. This can be accomplished by a certified mechanic or an Citroen dealer. If the issue is severe then you'll have to get it replaced. This is a fairly easy and inexpensive fix, but it's imperative to act swiftly. The longer you wait to fix the issue, the more difficult it becomes. It can be dangerous to passengers and yourself in the event that the issue isn't addressed.Receiver Module IssueIf your key fob ceases working, it might be due to the receiver module having developed a fault. This could be due to many things that include water damage. This can happen when you accidentally 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 help to stop the chip from corroding.You can reset the receiver module if you disconnect it from the battery for 10 seconds. You can then reconnect the battery and repeat the procedure. If this isn't enough to fix the issue, bring it to a dealer for replacement.Interference can cause your key to stop working. It could be caused by other transmitters that use the same frequency as your key fob or by objects inside your vehicle. If you're unable to fix the issue, 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 right the receiver module will not recognize the key and display an error message that states the key is not detected. This can be a frustrating issue particularly when trying to start your car.Dead 12 volt batteryIt is possible that your key fob has been damaged if it stops working after changing batteries. This is most likely to happen in the event that your key fob has been dropped or stepped upon however, it can also occur following a repair that requires the removal of the panels and reinstallation. When these panels are removed, wires are exposed. If your fob is damaged, it may require replacement completely.Another possibility is that the remote is getting interference from other devices or places. This can cause RF signals to become weaker and hinder the car from being able to recognize 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 electricity, allowing the system to reboot.Before replacing the battery, it's important to make sure that it's the right size and type. The circuit board in the fob's key could be damaged if the replacement battery is too large or has an incompatible voltage. Before you install a battery you must clean the chip of the fob to remove any corrosive substances. The proper type of battery will ensure that the key fob is properly sealed and shielded from moisture. Once the key fob is reinstalled, it should work normally. You can usually use the second key even in the event that your vehicle displays a message that reads "key is not recognized." You may have to press the button a few times before it responds.