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Citroen C3 Key Fob Troubleshooting The key fob of the Citroen C3 can cease to function due to different reasons. They can be due to worn buttons, poor contact between the battery and the water and receiver module problems. Examine genuine citroen key fob replacement . Deprogramming is a possible cause the key fob's inability to unlocking your car. This happens when certain button combinations send an email to the onboard computer requesting that the key be removed from its list of keys. Dead coin battery If the fob that you use to open the door on your Citroen C3 is no longer functioning, first check if the battery has died. Fobs utilize small, coin-shaped batteries that can be replaced within a few minutes. You can find these in general stores, home improvement stores, and some auto parts stores. Make sure you purchase the correct kind. The majority of fobs require CR2025 or CR2032 however, you must refer to the owner's manual of your vehicle to determine the exact type of battery your car requires. Remove the button pad, and use cotton swabs and alcohol to clean it. This will help remove corrosion and clean the contacts which are usually colored gold. Once the contacts are cleaned, you are able to put in the new battery. Be careful not to mix the two types as they have different voltages and diameters. The next step is to examine the battery's voltage. A multimeter that is set to the battery's voltage range should provide a precise reading. If the battery's voltage is in the middle or above the threshold, then it needs to be replaced. You could also start your car using a spare key. However, this might not always work. If the issue persists, visit a CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN dealer can obtain the code for your vehicle's immobiliser system, and request a replacement battery. Water damage When the key fob gets submerged, it could lose its signal to the car. If this occurs, it's a good idea to pull it out from the pool, puddle, or washing machine as fast as possible. After this make use of an swab of cotton and isopropyl or electronic cleaner to dry the circuit board. If it doesn't work It could be time for a new key fob. Signal interference is a different reason for Citroen remote control not working. This may occur when there is a strong electrical field in the vicinity of the vehicle or from other transmitters operating on the same frequency. Once you have left the interference area your key fob will start working again. Lastly, the Citroen C3 key fob may not function due to worn buttons and receivers, signal interference, module issues or a dead 12 volt battery, or a damaged electronic chip. If this happens, you'll probably have to have it changed by a certified expert. This can be done by a skilled mechanic or at a Citroen dealership. If the issue is significant the vehicle will need to be it replaced. It's a fairly simple and affordable fix. However, you need to get it done quickly. The longer you delay to correct the issue the worse it will become. It could be hazardous to passengers and you If the issue isn't addressed. Receiver Module Issue If your key fob is not functioning the receiver module could have developed an issue. It could be caused by a number of things like water damage. It can happen when you lose your keys, or wash them. You can fix the problem by removing and cleaning the chip with isopropyl alcohol, or electronic cleaner. This will help to prevent corrosion of the chip. You can also reset the receiver module if you disconnect it from the battery, and wait 10 seconds. You can then reconnect the battery and repeat the process. If this isn't enough to fix the problem, you can take it to a retailer to be replaced. Interference can also cause your key to stop working. It could be caused by other transmitters that operate on the same frequency as your key fob or by objects within your vehicle. If you're unable to solve the issue, you can take your key fob to an authorized dealer to have it 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 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 battery If your key fob stops working after the battery has been changed It 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 then reinstallation. When these panels are removed, the wires are exposed. If your fob is damaged, you may require a complete replacement. Another possibility is that the remote is receiving interference from other devices or locations. This can cause RF signals to weaken and stop the car from understanding the remote. If this happens it is possible to reset all on-board computers by disconnection of the battery at 12 volts for approximately 15 minutes. This will remove any residual power, allowing the system to reboot. It is crucial to determine the size and quality of the battery before replacing it. The circuit board on the fob's key could be damaged in the event that the replacement battery is too big or has an incompatible voltage. Before installing a new battery, you must clean the chip of the fob to remove any contaminants that could cause corrosion. The right battery type can ensure that the key fob is properly sealed and protected against moisture. Once the key fob is replaced, it should work normal. In the majority of cases, you can use the second key to start your vehicle even in the event that it displays a message of “key not detected.” It may be necessary to press the button multiple times before it responds.