Peugeot 208 Key Replacement
It is best to delegate the replacement of Peugeot keys for 208 to auto locksmiths who have the necessary equipment and technical know-how. They can program and create keys faster and less expensive than dealerships.
If the key fob has stopped locking or unlocking your doors, it is likely due to a dead coin battery. But, there are other reasons the key could be 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. If this is the case, you'll have to utilize the backup starting method that's described in your vehicle's owner manual.
The spark plugs may also be worn out. peugeot 3008 key fob G28 are responsible to ignite the fuel that powers the engine. They only last for a certain amount of time. If they are not used enough and they fail, they'll eventually die.
There is an easy solution to this issue. Check the voltage of your battery with a multimeter. If the voltage is lower than 11,5 volts then it's time to replace it. If the battery is damaged it is essential to clean its contacts. This can be accomplished by removing the rubber cover from the two terminals on the battery and then using a wirebrush to clean any parts of the battery that are corroded. You should then reconnect the cables for the positive and negative poles.
Water Damage
If your 208 isn't starting and the battery isn't running, then make sure that the spark plugs are functioning. You may find that they're dirty and they don't spark. The spark plugs can be cleaned in an workshop.

Peugeot cars are equipped with transponder keys that integrates with the car's immobiliser system. This ensures that only a valid key can turn the engine. If the chip inside the Peugeot key is damaged, it won't transmit the correct signal to the vehicle.
This is a very common issue that can be caused by water damage. This is a common problem in colder climates where the vehicle has been exposed to rain or snow. If this is the case, call a reputable auto locksmith who has all of the tools and equipment required to modify the new key. They also have the most up-to-date technology and equipment needed to make the Peugeot 208 smart key. The process shouldn't take more than 15 minutes.
Faulty battery contacts
Peugeot changed from the old carbon encased transponder chips to an entirely new type of chip that incorporates electronic components in a circuit board. The new system works great when it's brand new, but the circuit boards begin to degrade with time and cease to function properly.
This could stop the immobiliser from activating so the vehicle won't start. Contact an Peugeot specialist or a locksmith, if this is the case.
The most frequent issue is when the battery inside the key fob begins to die. This causes the blade of the key to stop feeding into the lock. A locksmith in your car will replace the battery, and then cut a fresh blade for you. This is a simple solution.
Faulty Receiver Module
It could be that the receiver module is faulty in the event that your Peugeot key fob doesn't work after being dropped on the floor, exposed to a sudden rainstorm or accidentally washed. The receiver is responsible for transmitting radio frequency signals to the onboard computer which controls the centralized locking system in your Peugeot vehicle.
Rubber seals on the key fob prevent water from getting to the electronic chip. The chip can be damaged by water if it is exposed to water for long periods of period of. Submerging the key fob into the ocean at the beach or throwing it into the pool could be particularly damaging due to the high salt content.
If your Peugeot spare key fob isn't working You'll need the module replaced. This can only be done by an Peugeot specialist or an expert auto locksmith. Unlike other cars, Peugeot keys are protected by an exclusive immobilizer system that requires the correct code in order to start the engine. This is the reason why you should only be able to trust a professional Peugeot locksmith for the job of designing and programming an appropriate replacement.
Computer on-board is not working properly
The on-board computer of your Peugeot is responsible for a variety of systems inside your car, including airbags and power windows. The on-board computer displays a code when something goes wrong. The code is stored within the system and will stay there until the problem is solved. This may require the on-board computers to be replaced.
One of the main reasons for the light flashing is loose or corroded connections in the airbag sensor. This could be due to wear and tear, aging or exposure to salt and moisture. It is crucial to get this issue addressed as quickly as possible, since the airbag malfunctioning could be dangerous in the event an accident.
If you see the error "card not found" on your Peugeot, the key battery in the key fob may be dead or weak. This can prevent the key fob from sending a signal to disable the immobilizer on your vehicle's standard. You can test this by pressing the unlock button on the key fob, then attempting to start your car. If this fails, then the key battery must be replaced.