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Peugeot 208 Key Replacement
It is best to leave the replacement of Peugeot keys 208 to auto locksmiths who have the necessary equipment and technical know-how. They can make and program new keys much quicker than a dealership and at a lesser cost.
If the key fob stopped locking or unlocking your doors, it is likely due to a dead battery in the coin. But, there are other possibilities that the key is malfunctioning.
Dead Coin Battery
A dead coin battery will stop your Peugeot 208 from locking and unlocking, as well as stopping it from starting the engine. In this scenario you'll have to choose the alternate method to start found in your vehicle's owner's manual.
The spark plugs can also be worn out. The spark plugs are responsible for igniting the fuel which starts the engine. They have a limited lifespan. If they aren't utilized enough they will eventually fail.
Luckily, there's an easy solution for this problem. Check the voltage of your battery with a multimeter. If it's below 11.5 Volts and you are not satisfied, then it is time to replace it. It is also essential to clean the contacts of the battery if it has corrosion. This can be done by taking off the rubber covers from the two battery terminals, and then using a wirebrush to remove any damaged parts of the battery. Then, reconnect the cables that connect the positive and negative poles.
Water Damage
If your 208 doesn't start and the battery isn't empty, you must ensure whether the spark plugs work. It could be that they are just overly dirty, causing them not to spark. This can be easily corrected by cleaning the spark plugs in a workshop.
Peugeot automobiles are equipped with a transponder compatible with the immobiliser. This ensures that only a valid key can turn the engine. If the chip inside the Peugeot key is damaged, it will not send the correct signal to the vehicle.
This is a frequent issue that can be caused by water damage. This is a typical issue in colder climates where the vehicle is exposed to rain or snow. In this case, contact an experienced locksmith who will have the tools and equipment needed to modify the key. They will also have the latest technology and equipment required to create the Peugeot smart key. The process shouldn't be more than 15 minutes.
Contacts to the battery are not working properly.
Peugeot replaced the old transponder chips with a brand new model that utilizes electronic components mounted on a circuitboard. The new system works great in its initial state, but the circuit boards deteriorate over time and cease to function properly.
This could prevent the immobiliser chip from working the immobiliser chip, causing your car not to start. If this is the case, it's best to call a Peugeot specialist or locksmith.

A common problem is when the battery of the key fob starts to fail. This causes the blade of the key to stop feeding into the lock. A locksmith in your car can replace the battery and cut a fresh blade for you, it's generally a quick fix.
Faulty Receiver Module
It could be that the receiver module is faulty If your Peugeot key fob doesn't work after being dropped on the floor, or exposed to a sudden downpour or accidentally washed. The receiver module is responsible for transmitting radio frequency to the onboard computer which manages the central locking system of your Peugeot vehicle.
The key fob itself has rubber seals that prevent water from getting to the electronic chip inside. However prolonged exposure to water could penetrate these seals and damage the chip. The high salt content in the pool or ocean water can cause damage to the key fob when it is submerged.
If your Peugeot spare key fob isn't working it is necessary to have the module replaced. This is only done by a skilled auto locksmith or Peugeot specialist. Peugeot keys like other cars are secured by an immobilizer system. G28CarKeys requires the right codes to start the car. This is why it is imperative that you should only rely on an authorized Peugeot locksmith to create and program the replacement.
Computer with a problem on board
The on-board computer in your Peugeot is responsible for a variety of the systems in your car, from airbags to power windows. The computer on board will display a code when something goes wrong. This code will be stored in the system until the issue is fixed. Often, this will involve replacing the onboard computer.
One of the main reasons for the airbag light turning on is loose or corroded connectors in the airbag sensor. This can be caused by wear and tear, aging, or exposure to moisture and salt. This problem should be taken care of as soon as you can, because an airbag that is not functioning could be dangerous in the event in the event of an accident.
If your Peugeot is showing a card detected as not present error then the key battery in the key fob might be dead or weak. This prevents the key fob from sending a signal that disarms your vehicle's standard immobilizer. Try this by pressing the unlock key on the fob's key and then trying to start your car. If it doesn't work, the key battery has to be replaced.