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Fiat Panda key fobs contain a transponder chip that sends signals to your car to open the doors or start the engine. The fob may stop working due to a variety reasons.

A dead battery for the coin is the most common reason for malfunctioning keys. Other reasons include water damage, the receiver module is defective and signal interference.

Dead Coin Battery

Replace the battery if the key fob has gone out of service. Make use of a new button battery that has the same voltage, size and specifications as the original.

If the key fob was exposed to water (such as saltwater or rain at the beach) It must be cleaned before using again. A paper towel soaked in alcohol or electronic cleaner will work wonders.

If the key fob doesn't working despite not being exposed to water, it could be due to a malfunction in the receiver module or internal electronic chip. In these cases, reprogramming the key fob using an OBDII scanner may help.

Water Damage

If your key fob's battery has taken immersed in a puddle or pool or even a trip to the washing machine, you might have some water damage. It's possible to get it working by removing the batteries and cleaning the circuit board with rubbing alcohol. It is best to allow the device to completely dry prior to installing a battery.

If your key fob isn't working even after replacing the battery and reprogramming it, you may have a faulty receiver module. Reprogramming instructions are available for the majority of vehicles' remote key fobs on YouTube or in the owner's guide. You can also reset the computer in your car with the OBDII scanner tool.

Faulty Receiver Module

The key fob contains an electronic chip that communicates with the vehicle's system. The chip will stop sending and receiving signals to the car if it becomes damaged. This could be due to dropping the key fob or by water exposure. If the key fob you have purchased has stopped working due to water exposure and you are unable to fix it if you clean the chip using electronic cleaner or isopropylethanol.

If the key fob does not respond following cleaning, it is likely that the receiver module is not functioning properly and will require to be replaced. A damaged receiver can cause the key to not work. This is usually due to electromagnetic interference.

Electronic chip that is malfunctioning

The electronic chip that is in your key fob is a vital function in the anti-theft security system of your car. It sends a signal to the immobiliser inside your car to tell it whether the key is legitimate. If the chip is damaged or damaged, your car won't start.

A damaged chip could be caused by interference from other objects, weather conditions or transmitters located near your vehicle. In this scenario you'll need an entirely new key fob.

Contacts for the battery that are defective

The battery contacts on the fob's key can be damaged through heavy use. If they are bent or broken the fob will not transmit any signals to the receiver modules in the car.

Modern fobs are designed with rubber seals in order to keep out water. Submerging them in water even if it's only a light drizzle or splash could damage the chip's electronic components.

The key fob has an electronic chip that communicates with the vehicle's immobilizer system to allow it to start. This system uses crypto coding systems in the latest vehicles as well as the traditional red key system in older ones. This chip will need to be replaced if it's defective.

The 12 Volt Battery is faulty

A faulty battery can cause the key fob to stop working. The car's system will not recognize the remote when this happens.

Test the battery with a voltmeter before replacing it to determine its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly the time is now to replace it.

Put an electrical load for a short time on the battery to check its capacity. This will remove 1percent of the charges. Then take another measurement of the voltage. The higher the capacity of the battery, the longer it can keep its voltage. It should be close to 12 volts for several minutes.

Faulty Radio Signal

This is the main reason for the key fob not sending signals to the car. The battery could be replaced to fix this issue. However, it is crucial to purchase a battery that has the same voltage and size as the original.

Fobs can take a lot abuse, but they're not impervious to destruction. The battery buttons and contacts are brittle, so they can get bent or broken by rough usage.

Other transmitters or objects using the same frequency could also interfere with a signal. For instance, a light-control panel near your home may transmit interference using the same bandwidth that key fobs use. This can interfere with the remote control of your car.

Problems with OBDII Scan Tool

There are many reasons why a scanner tool may not function. Some are more complex than others.

Professional scan tools allow a mechanic to look over the car's networks and run a variety of self-tests. These tools can save you a lot of time, but they are costly and are out of reach for most DIYers.

If your OBD2 scan tool fails to turn on, make sure you check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If these are OK, it's likely that a fuse is blowing. This is the most frequent reason for a scan tool to fail. It is typically easy to fix the problem by replacing the blown fuse.