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Fiat Panda Key Fob Replacement

Fiat Panda key fobs contain a transponder chip which sends an alert to your car to open the doors and start the engine. The fob could stop working due to a variety reasons.

The most commonly cited reason for key fob failure is a dead coin battery. Other causes include water damage or a malfunctioning module and interference signals.

Dead Coin Battery

Replace the battery if the key fob has failed. Use a button cell with the same voltage, size and specifications as the old one.

If the key fob was exposed to water (such as rain or saltwater at the beach) It must be cleaned prior to being used again. The best way to do this is using a paper towel that has been soaked in isopropyl, or electronic cleaner.

If the key fob is not working despite not being exposed water it could be due to a problem in the receiver module or internal electronic chip. Reprogramming the keyfob using an OBDII scan may help in these cases.

Water Damage

You could have water damage if your key fob was submerged in a puddle, pool or washing machine. You can usually get it back to working by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It's a good idea to allow the fob to dry completely prior to installing a new battery.

If your key fob has stopped working even after replacing the battery and reprogramming it, you may have a defective receiver module. You can find instructions for reprogramming most vehicles' remote keys on YouTube, or consult your owner's manual. You could also try resetting the car's onboard computer with the OBDII scan tool.

Faulty Receiver Module

The key fob is equipped with the chip that communicates with the vehicle's system. If this chip becomes damaged, it cannot longer transmit and receive signals to the vehicle. Dropping the key fob could result in this, as can exposure to water. If your key fob isn't working due to water exposure, you may be able to fix it if clean the chip with electronic cleaner or isopropyl ethanol.

If the key fob won't respond to cleaning, it's possible that the module has an issue and should be replaced. A damaged receiver module may also cause the remote control key to stop working. This is often caused by electromagnetic interference.

Electronic chip that is malfunctioning





The electronic chip inside your key fob is an essential part of the anti-theft system in your car. It sends a signal the immobiliser unit in your car to inform it whether the key is genuine. If the chip is damaged or broken, the car will not start.

A damaged chip could be caused by interference signals from other objects, bad weather conditions or transmitters operating on the same frequency near your car. In this situation, a new fob will be needed.

Contacts for the battery that are damaged

The battery contacts of a key fob can be damaged due to heavy use. If they're bent or damaged, the fob will not send any signals to receiver modules in the vehicle.

Modern fobs feature rubber seals that keep out water. A splash of water or a light rain is acceptable However, submerging them in saltwater could damage the electronic chip.

The key fob is equipped with chips that communicate with the vehicle's immobilizer to allow it to activate it. The system relies on cryptocoding systems in newer vehicles, or the old red key system in older ones. If the chip is defective it must be replaced.

Problematic 12 Volt Battery

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

Test the battery using the help of a voltmeter to determine its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly it's time to change it.

To determine the capacity of a battery put an electrical load on it for a couple of minutes. This will remove about 1% of the charge on the surface. Then take another measurement of the voltage. The better the battery's capacity, the longer it can keep its voltage. Ideally, it will remain close to 12 volts several minutes.

Faulty Radio Signal

This is the most typical reason for the key fob to stop sending signals to vehicles. The battery is able to be replaced to resolve this issue. However, it is crucial to choose a battery that is the same voltage and size as the original.

Fobs endure a lot of abuse, but they're also not indestructible. The battery buttons and contacts are brittle, so they can get bent or damaged by rough use.

Other transmitters or objects that use the same frequency can also disrupt the signal. A light-control panel in your home, for example can interfere with key fobs that have the same bandwidth. This could affect the remote control in your car.

my latest blog post with OBDII Scan Tool

There are many reasons why a scan tool may not work. Certain are more complicated than others.

Professional scan tools let a mechanic observe the car's network and run various self-tests. These tools can save time, but are expensive and out of reach for the majority of DIYers.

If your OBD2 scan tool doesn't turn on, make sure you check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If all is fine, a fuse may have failed. This is one of the most common causes of scan tool failure. It is generally easy to fix the problem by replacing the fuse that has blown.