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Citroen C3 Key Fob Troubleshooting Citroen key fobs might cease to function due to a variety of causes. Some of these include worn buttons or poor contact with the battery, water damage and receiver module problems. Check the 12 volt battery. Deprogramming may be the cause of your key fob not unlocking your car. This happens when certain button sequences send an alert to the onboard computer to remove the key from its access list. Dead coin battery If the fob that you use to open the door on your Citroen C3 is no longer working, first make sure the battery has gone out. Fobs use small coins-shaped batteries that can be replaced within a few minutes. They are available at general stores, home improvement stores, as well as some auto parts stores. Be sure to buy the correct type. The majority of fobs require CR2025 or CR2032 However, it is recommended to refer to the owner's manual of your vehicle to see the exact type of battery your car requires. Remove the button pad and then use cotton swabs or alcohol to clean it. They will remove the corrosion and clean the contacts which are typically gold-colored. Once the contacts have been cleaned, you are able to put in the new battery. Be careful not to mix up the two kinds as they have different voltages, diameters and shapes. The next step is to test the battery's current voltage. A multimeter that is calibrated to the battery's voltage range should give you a reliable reading. If the battery shows a value above or below its threshold, it needs to be replaced. You can also try starting your car with an extra key, but this may not work in all situations. If the issue persists, visit a CITROEN dealership with your V5 registration and personal identification documents. A CITROEN dealer can find the code of the immobiliser on your vehicle and purchase new batteries. Water damage If the key fob is submerged it can lose its signal. It is best to remove it as quickly as you can from the puddle or pool. After that using an swab of cotton and isopropyl or electronic cleaner to clean the circuit board. If it still doesn't work it could be time to get a new key fob. Signal interference is a different cause of Citroen remote control not working. It can happen when there is an electrical signal near the vehicle or other transmitters on the same frequency. Once you have left the area of interference the key fob will start working again. The Citroen C3 key fob could cease to function due to worn buttons or signal interference issues, receiver module issues, a dead 12-volt battery or a damaged chip. You'll need it changed to a new program when this happens. This can be accomplished by a qualified mechanic or at an Citroen dealership. If the issue is serious, you may need to replace it. It's a fairly simple and inexpensive fix. But you have to get it done quickly. The longer you delay to correct the issue the more deteriorated it becomes. It could be dangerous for passengers and you if the problem is not fixed. Receiver Module Issue If your key fob isn't functioning it could be because the receiver module might have developed a fault. This could be due to several things, including water damage. This could happen if you drop your keys or wash them. You can try to solve the problem by removing your chip and cleaning it with isopropyl or electronic cleaner. This will prevent the chip from corroding. You can also reset the receiver module if you disconnect it from the battery and wait 10 seconds. Then, reconnect the battery to the car and repeat the process. If this doesn't fix the issue, go to a dealership and have it replaced. Interference can also cause your key to stop working. This can be caused either by other transmitters on the same frequency or by objects inside your vehicle. If you're not able to fix the issue, go to a dealership to have your key fob 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 isn't correct, the receiver module won't recognize the key and will display a key not detected message. This can be a frustrating issue, especially when trying to start your car. Dead 12 volt battery If your key fob ceases working after changing the battery It could be damaged. This is most likely to happen when the key fob been thrown or stepped on However, it can happen after a service that requires the removal of panels and the reinstallation. Wires are exposed when the panels are removed. If your fob has been damaged, it might require replacement. Another possibility is that the fob may be receiving interference from other devices or locations. This can make the RF signals weaker and block the car's recognition of the remote. You can reset the on-board computer in this situation. You can do this by disconnecting the 12-volt battery for 15 minutes. G28 Car Keys will take away any remaining electrical energy, allowing the system to reboot. Before replacing the battery it's crucial to ensure it is the correct type and size. The circuit board that is inside the fob's key can become damaged when the replacement battery is too large or has a different voltage. You should also clean any corrosive materials from the chip in the fob prior to installing a new battery. Using the right battery can help ensure that it is properly sealed and shielded from moisture. Once the key fob is replaced, it should work normal. You should be able to use the second key even in the event that your vehicle displays a message that says “key is not recognized.” It could be necessary to press the button a few times before it responds.