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Citroen C3 Key Fob Troubleshooting Citroen c3 key fob can stop working due to a variety of reasons. The most common reasons are 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 indication to the onboard computer to remove the key from its list of access. Dead coin battery If your Citroen C3's key fob has stopped working the first thing you should look for is if the battery is dead. The batteries that are in the fobs are tiny, round coins that can be changed in a matter of seconds. They are available at home improvement stores, and even auto parts stores. Be sure to buy the correct model. Batteries for fobs are typically CR2025 or CR2032 However you should refer to the owner's manual of your vehicle to determine which kind of battery is needed. Remove the button pad and then use cotton swabs or alcohol to clean it. They will remove the corrosion and clean the contacts that typically have a gold color. Once the contacts are cleaned then you can put in the new battery. Be careful not to mix up the two types since they differ in voltage, diameters and shapes. The next step is to check the battery's voltage. A multimeter calibrated to the battery's voltage range should give you an accurate reading. If the battery's value is higher or lower than the threshold, it should be replaced. You can also start your vehicle using a spare key. However, this may not always work. If the issue persists then visit an CITROEN dealer with your V5 registration certificate and personal identifi cation documents. A CITROEN Dealer can retrieve the code for your vehicle's immobiliser and can order the replacement battery. Water damage If the key fob falls under water, it could 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 quickly as possible. Once you've done that make use of the cotton swab along with isopropyl or electronic cleaner to clean the circuit board. If it still doesn't work, it may be the right time to purchase a new key fob. Signal interference is a common reason for Citroen remote control not working. It can happen when there is a strong electrical field that is close to the car or from other transmitters on the same frequency. The key fob will begin to work again once you are out of the area of interference. The Citroen C3 key fob might stop working due to worn buttons and receivers, signal interference, module issues and a dead 12 volt battery, or an indefective electronic chip. If this happens, you'll probably require it to be replaced by a skilled technician. This can be done by a trained mechanic or at a Citroen dealership. If the problem is serious it is possible to replace it. This is a relatively simple and cost-effective fix, however it's crucial to act fast. The longer you wait to fix the issue, the more serious it becomes. It could pose a risk to passengers and yourself when the issue is not resolved. Receiver Module Issue If your key fob isn't working, the receiver module may have developed an issue. This can be caused by several things like water damage. G28 Car Keys can happen when you drop your keys, or wash them. You can try to fix the problem by removing and cleaning the chip using isopropyl ethanol 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 and repeat the procedure. If this does not resolve the issue, take it to a dealership to have it replaced. Another reason your key may be unable to function is due interference. It could be caused due to other transmitters that utilize the same frequency as your key fob or by objects within your vehicle. If you're unable to solve the issue, take your key fob to an authorized dealer and have it changed to a different frequency. 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 accurate it will not recognize the car key and display a message stating “key not recognized”. This is a problem that can be frustrating especially when trying to start your car. Dead 12 volt battery It is possible that your key fob is damaged if it ceases to function after changing batteries. This is most likely to happen when the key fob is dropped or stepped on. However, it also can occur after repair on your vehicle that requires the removal and reinstallation of panels. When the panels are removed, the wires are exposed. If your fob is damaged, you might have to replace it completely. Another possibility is that the fob receives interference from other devices or locations. The RF signals can cause to become weak and prevent the car from understanding the remote. You can reset the on-board computer if this is the situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will eliminate any remaining electricity and let the system start from scratch. It is essential to confirm the size and type of the battery prior to replacing it. If the replacement battery is too small or has an unsuitable voltage, it could harm the circuit board within the fob's key. Before installing a battery, you must clean the chip of the fob to eliminate any contaminants that could cause corrosion. The correct battery type will ensure that the key fob is properly sealed and protected against moisture. Once the key fob is put back in place, it should function normal. In the majority of cases, you can use the second key to start your car, even in the event that it displays a message of “key not found.” It might be necessary to press the button several times before it responds.