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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can stop working due to various reasons. This includes worn buttons, poor contact between the battery and the water and receiver module problems. It is also recommended to check the 12 volt battery. Deprogramming is a possible cause the key fob's 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 make sure the battery has died. The batteries that are in the fobs are tiny, round coins that can be easily changed in a matter of seconds. They are available at the general stores, home improvement stores, and a few auto parts stores. Make sure you buy the correct type, though. The majority of fobs require CR2025 or CR2032 However, you should consult your 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 and alcohol. This will remove any corrosion, and clean the contacts which are typically gold-colored. After the contacts have been cleaned, you can add the new battery. Be careful not to mix the two types since they have different voltages, sizes and diameters. The next step is to examine the battery's voltage. A multimeter that is calibrated to the battery's voltage range should provide you with a precise reading. If the battery's current value is higher or lower than the threshold, it should be replaced. You could also start your car with a spare key. However, this may not always work. If the issue continues you should visit a CITROEN dealer with your V5 registration form and personal identification documents. A CITROEN Dealer can obtain the code of the immobiliser on your vehicle and purchase a new battery. Water damage If the key fob is submerged it could lose its signal. It is best to remove it as soon as possible out of the pool or puddle. After that make use of an swab of cotton and isopropyl or electronic cleaner to dry the circuit board. If the key fob still isn't working, it may be time to buy an additional one. Signal interference is a different cause of Citroen remote controls not working. This could happen when there is a strong electrical field that is close to the vehicle, or from other transmitters on the same frequency. The key fob will begin to function again after you are out of the area of interference. The Citroen C3 key fob could cease to function due to worn buttons problems with signal interference, receiver module problems or a dead battery or a malfunctioning chip. You'll need it replaced in the event of this. This can be accomplished by a qualified mechanic or an Citroen dealer. If the problem is severe it's time to have it replaced. It's a relatively easy and affordable fix. But you have to act quickly. The longer you wait to fix the issue, the worse it becomes. It can be dangerous to passengers and you when the issue is not solved. Receiver module issue If your key fob isn't working the receiver module could have developed a fault. Water damage is one of the numerous causes. It can happen when you drop 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 keep the chip from getting corroded. You can also reset the receiver module when you disconnect it from the battery and then wait 10 seconds. Then, reconnect citroen key shell to the car and repeat the procedure. If this doesn't fix the issue, take it to a retailer for replacement. Interference can cause your key to stop working. It could be caused by other transmitters operating on the same frequency, or by objects in your vehicle. If you're unable to fix the issue, take your key fob in to an authorized dealer and have it 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 accurate the receiver won't recognize the car key and display a message saying “key not recognized”. This is a problem that can be frustrating especially when you attempt to start your car. Dead 12 volt battery It is possible that your key fob is damaged if it stops working after the change of batteries. This is especially true when the key fob is dropped or stepped on, but it can also happen after repair on your vehicle that requires the removal and reinstallation of panels. Wires become exposed when panels are removed. If your fob is damaged, you might have to replace it completely. A fob that is receiving interference from other devices and locations is a different possibility. This can make RF signals weaker and hinder the car's recognition of the remote. You can reset the on-board computer in this situation by disconnecting the 12-volt battery for 15 minutes. This will clear any residual electrical charge and allow the system to start again. It is crucial to determine the size and quality of the battery before replacing it. The circuit board on the key fob can be damaged when the battery you replace is too large or has different voltage. It is also recommended to clean any corrosive materials from the chip inside the fob prior to installing a new battery. The correct type of battery can ensure that the key fob is sealed and protected against moisture. Once the key fob is installed, it will function normal. In the majority of cases, you can use the second key to start your car when it displays an error message that reads “key not detected.” It may be necessary to press the button multiple times before it responds.