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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can cease to function due to a number of reasons. Some of them include worn buttons or poor contact with the battery, water damage, and receiver module problems. Examine the 12 volt batteries. If the key fob will not unlock your car, it could be experiencing deprogramming. This happens when certain button sequences send a signal to the onboard computer to erase the key from its list of access. Dead coin battery If your Citroen C3's main fob no longer works the first thing to look for is if the battery is dead. Fobs are small, coin-shaped batteries that can be replaced in just a few minutes. You can find these at the general stores, home improvement stores, and a few auto parts stores. Make sure you buy the correct battery, however. The majority of fobs require CR2025 or CR2032 However, you should check the owner's manual to find out the specific kind of battery your vehicle requires. Before replacing the battery, take off the button pad and rub it with cotton swabs or alcohol. This will remove any corrosion, and clean the contacts, which are usually gold colored. After cleaning the contacts and sanitized, you can then insert the new battery. Just be careful not to mix the two types as they differ in their voltages and diameters. Next, you will need to assess the voltage of the battery. You can obtain a precise reading using a multimeter, which is set to the battery's voltage range. If the battery's reading is either above or below the threshold, then it must be replaced. You can also start your vehicle using a spare key. However, this might not always work. If the issue continues, visit a CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN Dealer can obtain the code for your vehicle's immobiliser and order an upgrade to your battery. Water damage If the key fob is submerged, it can lose its signal. It is best to remove it as quickly as possible from the pool or puddle. Once you do dry the circuit board as best you can using the help of a cotton swab, dipped into isopropyl alcohol, or electronic cleaner. If the key fob does not work, it may be time to invest in an additional one. Signal interference is another common cause of Citroen remote controls not working. This could happen when there is an intense electrical field that is close to the car or from other transmitters on the same frequency. citroen ds3 replacement key cost should start to work again once you leave the zone of interference. The Citroen C3 key fob may be inoperable due to worn buttons and receivers, signal interference, module issues or a dead 12 Volt battery, or an indefective electronic chip. You'll have to get it replaced when this happens. This can be accomplished by a qualified mechanic or at a Citroen dealership. If the problem is serious, you may need to replace the device. This is a fairly easy and affordable fix, but it's essential to act quickly. The longer you take to resolve the issue, the more serious it will get. It can be dangerous to passengers and you if the problem is not resolved. Receiver Module Issue If your key fob isn't functioning, the receiver module may have developed a fault. This could be due to many things, including water damage. This can occur when you lose your keys or wash them. You can try to solve the problem by removing your chip and cleaning it with isopropyl or an electronic cleaner. This will stop the chip from corroding. You can reset the receiver module when you disconnect it from the battery and wait 10 seconds. Then, reconnect the battery and repeat the process. If this fails to fix the issue, go to a dealership and have it replaced. Another reason your key could be unable to function is due interference. This can be caused either by other transmitters using the same frequency or objects in your vehicle. If you are unable to resolve the issue, you can visit a dealer and 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 is not right the receiver won't recognize the car key and display a message saying “key not recognized”. This can be a frustrating problem especially when trying to start your vehicle. Dead 12 volt battery It is possible that your key fob may have been damaged if it stops working after changing batteries. This is more frequent when the key fob been thrown or stepped on, but can also occur after a service that requires the removal of the panels and reinstallation. Wires are exposed when these panels are removed. If your fob is damaged, you may require a complete replacement. A remote that receives interference from other devices and locations is another possibility. This could cause RF signals to weaken, preventing the car from being able to recognize the remote. You can reset the on-board computer in this situation by disconnecting the 12-volt battery for 15 minutes. This will eliminate any remaining electric current, allowing your system to restart. It is essential to verify the size and type of the battery prior to replacing it. The circuit board in the fob's key could be damaged if the replacement battery is too large or has an incompatible voltage. Before installing a new battery, you should clean the chip of the fob in order to eliminate any harmful substances. Using the correct type of battery can help ensure that it is properly sealed and protected from moisture. Once the key fob's been reinstalled it should function normally. It is usually possible to use the second key even when your car displays a message that reads “key is not recognized.” It could be necessary to press the button several times before it responds.