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fiat Punto Key fob fiat panda remote key replacement key fobs contain a transponder chip which sends an alert to your car to unlock the doors or start the engine. However, the fob may not function due to a variety of reasons.

The most frequent cause of key fob failure is an inoperable coin battery. Other causes are water damage, a faulty receiver module and signal interference.

Dead Coin Battery

If your key fob's battery is dead, the first step is to replace it. Use a new button cell battery with exactly the same size, voltage, and specification as the original.

If the key fob was exposed to water, like a splash of rain or salt water on the beach, it will need to be cleaned before it can be used again. A paper towel soaked with isopropyl alcohol or electronic cleaner can help.

If the spare key for fiat 500 fob isn't working despite not being exposed water, it could be due to a glitch in the receiver module or in the internal electronic chip. In these instances you can reprogramme the key fob using an OBDII scanner can help.

Water Damage

If your key fob has taken an immersion in the puddle or pool or even a trip down the wash machine, you could be suffering some water damage. It's generally possible to repair it by getting rid of the batteries and cleaning the circuit board using ruby alcohol. It is best to let the board completely dry before installing a battery.

You may have a faulty module when your key fob ceases working after replacing the battery or reprogramming. There are reprogramming guidelines for the majority of vehicles' remote key fobs on YouTube or in the owner's manual. You can also try resetting the car's onboard computer using the OBDII scan tool.

Faulty Receiver Module

The key fob contains a chip which communicates with the vehicle's system. If the chip is damaged, it can no longer be able to send or receive signals to the vehicle. This could be due to dropping the key fob or through exposure to water. If your key fob isn't functioning due to exposure to water it is possible fix the issue if you clean the chip with electronic cleaner or isopropyl alcohol.

If the key fob does not respond to cleaning, it is possible that the component has an issue and must be replaced. A faulty receiver can also cause the key to not work. This is typically caused by electromagnetic interference.

Faulty Electronic Chip

The electronic chip inside your key fob plays a vital part in the anti-theft security system in your car. It sends a signal to the immobiliser inside your car to tell it whether the key is genuine. If the chip is damaged or broken, your vehicle will not start.

A malfunctioning chip could be caused by interference signals from other objects or weather conditions that are bad, or transmitters on the same frequency in close proximity to your car. In this case, you will need an entirely new key fob.

Contacts for the battery that are damaged

The battery contacts in the key fob are delicate and can get damaged through repeated use. If they're bent or broken the fob will not be able to send any signals to the receiver modules in the car.

Modern fobs come with rubber seals that block out water. A splash of water or light rain is fine, but submerging them in saltwater can damage the chip's electronic components.

The key fob has chip that communicates with the immobilizer system of the vehicle in order to start it. This system utilizes cryptocoding systems in the latest vehicles, or the old red key system used in older ones. This chip will have to be replaced if it's malfunctioning.

Faulty 12 Volt Batterie

A malfunctioning battery could cause the key fob to cease working. The car's computer may not recognize the remote when this happens.

Before you replace the battery, you should test it with a an voltmeter for determining its capacity. A fully charged battery will read 12.6 volts. If the reading drops significantly then it's time to replace the battery.

To determine the capacity of a battery, place an electrical load on it for a couple of minutes. This will take off approximately 1 percent of the surface charge. After that, take the voltage again. The longer the battery is able to keep its voltage steady more effectively, the greater its capacity. It should be at 12 volts or less for several minutes.

Radio Signal Faulty Radio Signal

This is the main cause of a key fob that stops sending signals to the car. The battery is able to be replaced to resolve this issue. However, it is crucial to choose a battery with the same voltage and size as the original.

Fobs can take a lot abuse, but they're also not indestructible. Contacts on batteries and buttons can be damaged through rough handling.

Other transmitters or objects using the same frequency can also disrupt the signal. For instance, a light control panel that is near your home could transmit interference on the same frequency that key fobs utilize. This can interfere with the remote control in your car.

Incorrect OBDII scan tool

There are many reasons scanners may not work. Some are more complicated than others.

Professional scan tools let mechanics to observe the car's network and run various self-tests. These tools can save a lot of time, but they're expensive and not accessible to the majority of DIYers.

If your OBD2 scan tool won't power on, make sure you check the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If both are in good condition it's possible that a fuse is blowing. This is the most frequent cause of scan tool failure. The easiest fix is to replace the blown fuse.