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Citroen C3 Key Fob TroubleshootingThe key fob of the Citroen C3 can stop working due to different reasons. The most common reasons are worn buttons or poor contact with the battery, water damage and receiver module issues. You should also check the 12 volt battery.If your key fob does not unlock your car, you could 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 your Citroen's C3's key fob no longer works The first thing you need to determine is if the battery is dead. Fobs have small coin-shaped batteries which can be replaced in a few minutes. They are available in general stores, home improvement stores, and auto parts stores. Make sure you purchase the correct model. Batteries for fobs are usually CR2025 or CR2032, however you should check the owner's manual for your vehicle to determine what type is required.Remove the button pad and use cotton swabs and alcohol to clean it. These will help remove corrosion and clean the contacts, which are typically colored gold. Once the contacts are cleaned, you can then install the new battery. Be cautious not to mix the two batteries as they differ in voltage, dimensions, and shapes.Next, you will need to assess the voltage of the battery. You can get an accurate reading using a multimeter which is set to the battery voltage range. If the battery's voltage is either above or below the threshold, then it needs to be replaced. You may also try to start your car using a spare key, but this might not work in all situations. If the issue continues then visit an CITROEN dealer with your V5 registration documents and personal identification documents. A CITROEN dealer will be able to retrieve the code for your vehicle's immobiliser system and purchase the replacement battery.Water damageIf the key fob is submerged it can lose its signal. It's best to remove it as fast as you can from the puddle or pool. Once you have done that dry the circuit board as best you can with the help of a cotton swab, dipped into isopropyl alcohol or electronic cleaner. If citroen ds3 key fob does not work, it may be time to get a new one.Signal interference is another common reason for Citroen remote control not working. It can happen when there is an electrical field close to the car or other transmitters on the same frequency. The key fob is expected to begin to function again after you leave the zone of interference.The Citroen C3 key fob can not function because of worn buttons, signal interference issues, receiver module problems or a dead battery, or a defective chip. You'll need it replaced when this happens. This can be done by a trained mechanic or at an Citroen dealership. If the issue is serious it's time to have it replaced. It's a relatively easy and affordable fix. However, you need to take action quickly. If you put off fixing the issue, the worse it gets. It can be dangerous to passengers and yourself when the issue is not addressed.Receiver Module IssueIf your key fob ceases working, it could be because the receiver module has developed an issue. This could be due to many things like water damage. This can happen if lose your keys, or wash them. It is possible to fix it by removing the chip and cleaning it with isopropyl or electronic cleaner. This will help to avoid the chip from becoming damaged.You can also reset the receiver module when you disconnect it from the battery, and wait 10 seconds. Then, reconnect the battery to the car and repeat the process. If this fails to fix the issue, you can visit a dealership to have it replaced.Interference can also cause your key to stop working. This can be caused by other transmitters using the same frequency as your key fob or by objects inside your vehicle. If you are unable to resolve the problem, you can visit a dealer 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 right, the receiver module will not recognize the key and display the message "Key not detected. This could be a very frustrating issue, particularly when trying to start your car.Dead 12 volt batteryIf your key fob stops working after an upgrade to a battery the device could be damaged. This is more common when the key fob been thrown around or stepped on however, it can also occur after a service that requires the removal of panels and the reinstallation. Wires are exposed when the panels are removed. If your fob is damaged, it may require replacement completely.Another possibility is that the remote may be receiving interference from other devices or places. This could cause RF signals to weaken and stop the car from recognizing the remote. If this is the case you can reset all computer systems on board by disconnecting the battery with 12 volts for approximately 15 minutes. This will remove any residual electrical energy, allowing the system to restart.It is crucial to determine the size and type 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 large or has an unrelated voltage. Before installing a battery you should clean the chip inside the fob in order to eliminate any contaminants that could cause corrosion. The correct battery type will ensure that the key fob is sealed and shielded from moisture. After the key fob has been put back in place, it should function normal. In the majority of cases, you can use the second key to start your car, even if it shows an error message that reads "key not detected." It might be necessary to press the button multiple times before it responds.