Peugeot 208 Key Replacement
Peugeot 208 key replacement is best left to professional auto locksmiths who have the appropriate tools and know-how. They can create and program keys quicker and more efficiently than dealerships.
If the key fob has stopped locking or unlocking your doors, it could be due to a dead coin battery. There are also other reasons that the key could be malfunctioning.
Dead Coin Battery
A dead coin battery will stop your Peugeot 208 from locking and unlocking, as well as hindering it from starting the engine. In this instance you'll need to employ the alternate method of starting found in your vehicle's owner's manual.
The spark plugs can also be worn out. G28 Car Keys are responsible for sparking the fuel that starts the engine. However they have a finite life span. If they aren't utilized enough they will eventually fail.
There is a simple solution to this problem. The best solution is to check the voltage of your car battery using a multimeter. If it's less than 11.5 volts it is time to replace it. It is also important to clean the contacts of the battery when it has corrosion. You can do this by lifting the rubber covers that protect the two terminals of the battery and using wire brushes to clean any corroded parts of the battery. After that, you need to connect the positive and negative pole cables.

Water Damage
If your 208 won't start and the battery isn't flat then you should check that the spark plugs are working. It could be that they are just overly dirty, causing them not to spark. This can be fixed by cleaning the spark plugs in a workshop.
Peugeot cars have a transponder style key that integrates with the car's immobiliser system. This makes sure that only the correct key can start the engine. If the chip inside the Peugeot key is damaged, it will not send the proper signal to the vehicle.
This is a very common issue that can be caused by water damage. This is particularly common in colder climates. the vehicle could have been exposed to snow or rain. If this is the case, seek out a reputable auto locksmith who has all of the tools and equipment needed to modify the new key. They will also have all the latest technology and equipment required to make a Peugeot smart key. The process shouldn't take more than 15 minutes.
Faulty Battery Contacts
Peugeot replaced the transponder chips by introducing a new type that uses electronic components that are mounted on a circuit board. The new system is excellent in its initial state, but the circuit boards begin to degrade with time and stop working properly.
This could prevent the immobiliser from activating so your vehicle won't be able to start. Contact an Peugeot specialist or a locksmith, if this is the case.
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 will replace the battery and cut a new blade for you. This is a quick fix.
Faulty Receiver Module
It could be that the receiver module has a problem if your Peugeot key fob doesn't work after being dropped on the floor, or exposed to a sudden rainstorm or accidentally washed. The receiver is responsible for sending radio frequency signals to the onboard computer which controls the centralized locking system inside your Peugeot vehicle.
The key fob itself is fitted with rubber seals to prevent water from reaching the chip inside. However prolonged exposure to water can be able to penetrate these seals and cause damage to the chip. The high salt content in the ocean or pool could cause damage to the key fob if it is submerged.
The module will need to be replaced if the Peugeot spare key no longer works. This can only by done by a Peugeot specialist or expert auto locksmith. Like other automobiles, Peugeot keys are protected by a unique immobilizer system that requires the correct programming to start the engine. This is the reason why you should only trust an experienced Peugeot locksmith with the task of programming and creating the replacement.
Faulty On-Board Computer
The on-board computer inside your Peugeot is responsible for a variety of the systems in your vehicle, from airbags to power windows. If something is wrong with these systems, they will usually show a code that identifies the issue. The code will be stored within the system until the issue is resolved. This could mean that the on-board computers to be replaced.
The most frequent cause for the airbag warning light to turn on is corrosion or loose connections in the sensor. This can be caused by wear and tear, aging, exposure to salt and moisture. It is essential to have this issue addressed as soon as possible, since an airbag that is malfunctioning can be dangerous in the event of an accident.
If you find the error "card not found" on your Peugeot, the key battery in the key fob might be weak or dead. This prevents the key fob from sending a signal that disables the immobilizer on your vehicle's standard. Try this by pressing the unlock key on the fob's key and then trying to start your vehicle. If it doesn't work it is because the battery of the key has to be replaced.