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Citroen C3 Key Fob Troubleshooting Citroen key fobs can stop working due to a number of causes. These include worn buttons, poor contact with the battery, water damage and issues with the receiver module. Examine the 12 volt batteries. Deprogramming may be the cause the key fob's inability to unlocking your car. This occurs when certain buttons send an email to the onboard computer, asking that the key be removed from its list of keys. Dead coin battery If your Citroen C3's main fob is not working The first thing you need to determine is if the battery is dead. The batteries contained in the fobs are tiny, round coins that can be easily changed in a matter of seconds. They can be found in general stores, home improvements stores, and auto parts stores. Make sure you purchase the correct type, though. Fobs typically require CR2025 or CR2032 However, you should look through the owner's guide to determine the exact type of battery your car requires. Before replacing the battery, remove the button pad and rub it using cotton swabs and alcohol. This will help to remove corrosion and clean the contacts which are typically colored gold. After the contacts have been cleaned, it is now time to put in the new battery. Just be careful not to mix the two batteries because they have different voltages and sizes. The next step is to check the battery's voltage. You can get a precise reading using a multimeter, which is set to the battery's voltage range. If the battery's value is either above or below the threshold, then it needs to be replaced. Try to start your car using a spare key, but it may not be effective in all cases. If the issue continues go to a CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN dealer can locate the code for your vehicle's immobiliser system and purchase a replacement battery. Water damage When the key fob goes underwater it may lose its signal to the car. If this occurs, it's a good idea to pull it out of the pool, puddle or washing machine as soon as you can. After that, use an swab of cotton and isopropyl or electronic cleaner to clean the circuit board. If the key fob does not work, it may be time to invest in another one. Another common cause for Citroen remote control c3 not working is signal interference. This can occur when there is an electrical field in the vicinity of the vehicle or other transmitters on the same frequency. Once you have left the interference area your key fob should restart working. The Citroen c3 key fob can cease to function due to worn buttons and receivers, signal interference, module issues and a dead 12 volt battery, or a damaged electronic chip. If this happens, you'll likely need to get it changed by a certified expert. This can be done by a certified mechanic or at an Citroen dealership. If the issue is severe it's time to have it replaced. This is a fairly easy and affordable fix, but it's imperative to act swiftly. If you put off fixing the issue, the more difficult it becomes. It could be hazardous to you and your passengers If the issue isn't solved. Receiver Module Issue If your key fob ceases functioning, it could be because the receiver module has developed an issue. This can be caused by several things, including water damage. This could happen if you accidentally drop your keys or wash them. You can solve the problem by removing your chip and cleaning it with isopropyl and electronic cleaner. This will help to keep the chip from getting damaged. You can reset the receiver module if you disconnect it from the battery and wait 10 seconds. Then, reconnect the battery and repeat the process. If this does not fix the issue, take it to a dealer to have it replaced. Interference can cause your key to stop working. replacement key for citroen c1 can be caused by other transmitters that operate on the same frequency as your key fob or even objects in your vehicle. If you're not able to fix the problem, you can visit a dealer 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 in order, the receiver module won't recognize the key and will display a key not detected message. This can be a gruelling problem, especially when you're trying to start your vehicle. Dead 12 volt battery It is possible that your key fob has been damaged if it ceases to function after changing batteries. This is more frequent if your key fob has been dropped or stepped upon, but can also occur following a repair that requires the removal of panels and then reinstallation. Wires are exposed when the panels are removed. If your fob is damaged, you might have to replace it completely. A remote that receives interference from other devices or locations is a second possibility. This can cause RF signals to become less effective and hinder the car's recognition of the remote. If this is the case you can reset all on-board computers by disconnection of the battery with 12 volts for about 15 minutes. This will eliminate any remaining electrical energy, allowing the system to reboot. Before replacing the battery it's crucial to ensure it's of the correct size and type. If the battery you replace is too small or has an incompatible voltage, it can damage the circuit board inside the key fob. You should also remove any corrosive substances from the chip in the fob prior to installing the new battery. The right battery type can ensure that the key fob is sealed and protected against moisture. Once the key fob is put back in place, it should function normal. In most instances, you will be able to use the second key to start your car, even if it shows a message saying “key not found.” You may need to press the button several times before it responds.