20 Irrefutable Myths About Fiat 500 Keys: Busted Fiat Panda Key Fob Replacement

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

The most common reason for key fob failure is the battery of the coin is dead. Other causes are water damage or a damaged module and interference signals.

Dead Coin Battery

If the battery in your key fob has failed, the initial step is to replace it. Choose a button battery that has the same voltage, size, and specifications as the previous one.

If the key fob was exposed to water, like a splash of rain or salt water on the beach, it's going to need to be cleaned before it can be used again. The trick is to use an old towel soaked in isopropyl or electronic cleaner.

If the key fob hasn't been exposed to water but isn't working, there may be a problem with the receiver module or an internal electronic chip. In these cases it is possible to re-programme the key fob with an OBDII scanner may help.

Water Damage

You might have water damage if your key fob was submerged in a puddle, pool or washing machine. It's possible to repair it by getting rid of the batteries and cleaning the circuit board with rubbing alcohol. It is best to let the board completely dry prior to installing the battery.

It could be that you have a defective module in the event that your key fob stops working after replacing the battery or reprogramming. There are reprogramming guidelines for most vehicles' remote key fobs on YouTube or in your owner's guide. You could also try resetting the car's onboard computer using the OBDII scan tool.

Faulty Receiver Module

The key fob contains the chip that communicates the vehicle's system. The chip will stop sending and receiving signals to the car if damaged. This could be due to dropping the key fob, or by water exposure. If the key fob has stopped working after water exposure it is possible to fix it by cleaning the chip using isopropyl ethanol or electronic cleaner.

If the key fob doesn't respond to cleaning, it's possible that the receiver module has issues and needs to be replaced. A faulty receiver can also cause the key to cease to function. This usually happens due to electromagnetic interference.

Faulty Electronic Chip

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


A malfunctioning chip can be caused by interference from other objects, weather conditions or transmitters in the vicinity of your vehicle. In this case you'll need a new key fob.

Contacts for the battery that are defective

The battery contacts inside a key fob are very fragile and are susceptible to damage through repeated use. If they're broken or bent, the fob will not transmit any signals to the receiver modules inside the car.

Modern fobs are equipped with rubber seals that keep out water. Submerging them in water even if it is just an occasional drizzle or splash could damage the electronic chip.

The key fob has a chip which communicates with the immobilizer system of the vehicle to start it. The system uses the old red keys for older vehicles or the cryptocoding system found in the latest vehicles. This chip will have to be replaced if damaged.

Problems with 12 Volt Batteries

A damaged battery can cause the remote to cease 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. TheKeyLab charged battery should read 12.6 volts. If the reading drops dramatically then it's time to replace it.

To test the battery's power, place an electrical load on it for a few minutes. This will eliminate 1percent of the charges. Then, measure the voltage again. The longer the battery can keep its voltage steady and the higher its capacity. Ideal is that it stays close to 12 volts for several minutes.

The radio signal is not working properly. Radio Signal

This is the most common reason for a key fob that ceases to send signals to the car. The battery could be replaced to fix this issue. It is important to buy a battery with the same dimensions and voltage as the original.

Fobs take a lot of abuse, and they aren't indestructible. Contacts and buttons on batteries can be damaged through rough handling.

Other transmitters or objects operating on the same frequency can interfere with a signal. A light-control system in your home, for instance, may interfere with key fobs which use the same frequency. This can interfere with your car's remote control.

Incorrect OBDII Scan Tool

There are a variety of reasons why scanner tools may not function. Some are more complex than others.

Professional scan tools enable a mechanic observe the car's network and run various self-tests. These tools can help save time, but are costly and not accessible to most DIYers.

If your OBD2 scan tool won't power on, make sure you check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If both are in good condition the fuse could have ruptured. This is among the most common causes of a scan tool failing. The easiest fix is to replace the fuse which has blown.