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Citroen C3 Key Fob Troubleshooting Citroen key fobs can stop working due to a variety of reasons. Some of these include worn buttons that are not in contact with the battery, water damage and receiver module problems. Make sure the batteries are 12 volts. Deprogramming may be the cause of your key fob not unlocking your car. This occurs when certain buttons send an alert to the onboard computer, asking that the key be removed from its list of keys. Dead coin battery If the key fob on your Citroen C3 is no longer working, first determine if the battery has gone out. Fobs are small coins-shaped batteries that can be replaced in just a few minutes. You can find these in general stores, home improvement stores, and even auto parts stores. Make sure you purchase the correct model. The batteries for fobs are usually CR2025 or CR2032, however, you should consult the owner's manual of your vehicle to determine which type is required. 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 usually colored gold. After the contacts have been cleaned, you can put in the new battery. Be careful not to mix the two batteries because they differ in their voltages and diameters. The next step is to assess the voltage of the battery. You can get a reliable reading using a multimeter, which is set to the battery voltage range. If the battery is at the value that is either above or below its threshold, it needs to be replaced. You may also try getting your car started using an additional key, however this might not work in all situations. If the problem persists then visit an CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN dealer can locate the code for the immobiliser on your vehicle and get the replacement battery. Water damage If the key fob is under water, it could lose its signal to the car. If this occurs, it's a good idea to fish it out of the pool, puddle, or washing machine as fast as you can. Once you've done that then use an swab of cotton and isopropyl or electronic cleaner to clean the circuit board. If it doesn't work, it may be time for a new key fob. Signal interference is another frequent reason for Citroen remote control not working. It can happen when there is a strong electrical field close to the car, or from other transmitters operating on the same frequency. The key fob is expected to begin to work again once you are out of the zone of interference. The Citroen C3 key fob might be inoperable due to worn buttons, signal interference issues, receiver module issues as well as a dead 12-volt battery or a malfunctioning chip. You'll need it changed to a new program in the event of this. This can be done either by a trained mechanic or an Citroen dealer. If the problem is serious you may have to replace it. It's a fairly simple and affordable fix. But you should act quickly. The longer you take to resolve the issue, the more deteriorated it becomes. If the issue isn't resolved it could be a risk for the passengers and yourself. Receiver module issue If your key fob ceases functioning, it could be because the receiver module has developed a fault. It could be caused by various factors like water damage. This could happen if you drop your keys or wash them. You can try to fix the problem by taking off the 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 procedure. If this doesn't fix the issue, visit a dealership to get it replaced. Interference can also cause your key to stop working. It could be caused by other transmitters that utilize the same frequency as your key fob, or by objects within your vehicle. If you're unable to fix the issue, bring your key fob to a dealer and have it replaced. 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 will not recognize the key and display an error message that states the key is not detected. G28 Car Keys could be a very frustrating issue, especially if you're trying to start your vehicle. Dead 12 volt battery If your key fob stops working after an upgrade to a battery the device could be damaged. This is more likely when the key fob been dropped or stepped upon however, it can also happen after a service that requires the removal of panels and then reinstallation. Wires are exposed when these panels are removed. If your fob was damaged, it may require replacement completely. A fob that is receiving interference from other devices and locations is another possibility. This could cause RF signals to become weak and prevent the car from understanding the remote. If this is the case you can reset all computer systems on board by disconnecting the battery that is 12 volts for around 15 minutes. This will remove any remaining electricity and let the system start again. It is essential to confirm the size and type of the battery prior to replacing it. The circuit board that is inside the fob's circuit board could be damaged in the event that the replacement battery is too large or has an unrelated voltage. Before installing a new 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 sealed and shielded from moisture. After the key fob has been reinstalled it should function normally. You can usually use the second key even when your car displays a message that reads “key not detected.” You may have to press the button a few times before it responds.