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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can stop working for a variety of reasons. This includes worn buttons, poor contact between the battery and the water and issues with the receiver module. It is also recommended to check the 12 volt battery. citroen c3 replacement key may be the cause the key fob's not unlocking your car. This happens when certain key sequences send a signal to the computer in the car to delete the key from its access list. Dead coin battery If your Citroen C3's key fob no longer works the first thing to examine is whether the battery is dead. Fobs have small, coin-shaped batteries that can be replaced in a few minutes. They are available in general stores, home improvements stores and auto parts stores. Make sure you purchase the correct model, however. For fobs, batteries are typically CR2025 or CR2032, however, you should consult the owner's manual for your vehicle to determine what kind of battery is needed. Before you replace the battery, remove the button pad and rub it with alcohol and cotton swabs. This will help remove corrosion and clean the contacts which are typically colored gold. Once the contacts are cleaned, you can insert the new battery. Be careful not to mix the two types since they differ in voltage, diameters and shapes. The next step is to test the battery's voltage. You can get a reliable reading using a multimeter, which is calibrated to the battery's voltage range. If the battery's voltage is in the middle or above the threshold, then it needs to be replaced. You could also start your car by using a spare key. However, this may not always work. If the issue continues, go to a CITROEN dealership with your V5 registration number and personal identification documents. A CITROEN Dealer can obtain the code for your vehicle's immobiliser, and then order the replacement battery. Water damage If the key fob is submerged it could lose its signal. It is best to remove it as quickly as you can out of the pool or puddle. After that using a cotton swab, isopropyl or electronic cleaner to clean the circuit board. If the circuit board is still not working then it's time to get a new key fob. Another reason that is commonly cited for Citroen remote control c3 not working is signal interference. This could happen if there is an electrical signal near the car or other transmitters using the same frequency. The key fob should begin working again after you leave the zone of interference. Additionally, the Citroen C3 key fob could be inoperable due to worn buttons signals, signal interference, receiver module issues or a dead 12 volt battery, or a malfunctioning electronic chip. If this happens, you'll probably require it to be reprogrammed by an expert. This can be done by a trained mechanic or a Citroen dealer. If the issue is severe it is possible to replace it. This is a simple and inexpensive fix, but it's important to act quickly. The longer you take to address the issue, the more severe it will be. It could be dangerous for passengers and yourself If the issue isn't addressed. Issue with the Receiver module If your key fob is not working it could be because the receiver module might have developed an issue. Water damage is one of the many reasons. This can happen if lose your keys, or wash them. You can resolve the issue by removing and cleaning the chip using isopropyl alcohol 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 and repeat the procedure. If this does not fix the issue, you can take it to a dealership to have it replaced. Another reason why your key might not work is due to interference. It could be caused due to other transmitters that operate on the same frequency as your key fob, or by objects in your vehicle. If you're unable fix the issue, go to a dealership 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 correct the receiver will not recognize the car key and display a message saying “key not recognized”. This is a problem that can be frustrating, especially when trying to start your vehicle. Dead 12 volt battery If your key fob ceases working after a battery change it could be damaged. This is more likely when your key fob has been thrown around or stepped on, but can also happen after a service that requires the removal of panels and then reinstallation. Wires are exposed as panels are removed. If your fob has been damaged, it may require replacement. A fob that is receiving interference from other devices and locations is also a possibility. This can make RF signals weaker and block the car from recognizing the remote. You can reset the on-board computer in this situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will erase any remaining electrical charge and allow the system to begin again. It is important to check the size and type of the battery before replacing it. The circuit board on the fob's key could be damaged when the battery you replace is too large or has an unrelated voltage. Before installing a battery, you should clean the chip of the fob to remove any contaminants that could cause corrosion. Using the right type of battery will ensure that it is sealed and shielded from moisture. Once the key fob's been installed, it should work normally. In most instances, you can use the second key to start your car, even in the event that it displays the message “key not found.” You may need to press the button a few times before it responds.