Peugeot 208 Key Replacement
It is recommended to leave the replacement of Peugeot keys 208 to auto locksmiths equipped with the required equipment and know-how. They can make and program new keys much faster than a dealership would and at a cheaper cost.
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 might be malfunctioning.
Dead Coin Battery
A dead battery in the coin compartment will stop your Peugeot 208 from locking or unlocking and will not start the engine. In this scenario you'll need to use the alternative starting method as described in your vehicle's owner's manual.

The spark plugs might also be worn out. Spark plugs are what ignite the fuel to start the engine. They have a limited life span. They will eventually break down if they aren't used frequently enough.
Fortunately, there's an easy solution for this issue. The best thing to do is to check the voltage of your car battery with a multimeter. If it's lower than 11.5 Volts then you must replace it. If the battery has corroded it is essential to clean its contacts. This can be accomplished by removing the rubber covers from the two battery terminals and then using a wirebrush to remove any parts of the battery that are corroded. It is then time to reconnect your cables to connect the positive and negative poles.
Water Damage
If your 208 doesn't start and the battery isn't flat, then you need to make sure that the spark plugs are working. You may find that they are dirty and they don't spark. This can be fixed by cleaning the spark plugs in a workshop.
Peugeot automobiles are equipped with a transponder that is compatible with the immobiliser. This makes sure that only the correct key can turn the engine. If the chip in the Peugeot key is damaged, it won't send the correct signal to the vehicle.
Water damage is a common cause of this issue. This is a typical issue in warmer climates where the vehicle has been exposed to snow or rain. If this is the case, you should get in touch with a reputable locksmith who has all the tools and equipment required to modify the new key. They will also have all the latest technology and equipment required to create a Peugeot smart key. The process shouldn't take more than 15 minutes.
Contacts to the battery are not working properly.
Peugeot replaced the transponder chips using a new version that makes use of electronic components that are mounted on a circuitboard. This new technology works great when it's brand new, but as time passes, the circuit boards start to degrade and stop working properly.
This could prevent the immobiliser chip from working the immobiliser chip, causing your car not to start. Contact a Peugeot specialist or a locksmith, if this is the situation.
Another common issue is when the key fob battery begins to fail, which causes the blade of the key to stop getting into the lock. A locksmith in your car can replace the battery and cut a fresh blade for you, this is usually a simple fix.
Faulty Receiver Module
If your Peugeot key fob was not working after dropping it on the floor, getting exposed to a sudden rain or accidently washing it the wrong way, it could be due to a faulty receiver module. The receiver is responsible for transmitting radio frequency signals to the on-board computer, which is responsible for controlling the centralized locking system inside your Peugeot vehicle.
The rubber seals on the key fob block water from reaching the electronic chip. However prolonged exposure to water could cause damage to these seals and the chip. The high salt content in the pool or ocean waters could cause damage to the key fob if it is submerged.
If your Peugeot spare key fob doesn't work it is necessary to have the module replaced. This should be done by an Peugeot specialist or a professional auto locksmith. In contrast to other vehicles, Peugeot keys are protected by a unique immobilizer system that requires the correct coding in order to start the engine. This is why you must go with a knowledgeable Peugeot locksmith for the job of programming and creating a replacement.
Computer malfunctioning on-board
The computer on board in your Peugeot is the one responsible for all of the systems in your vehicle, from power windows to airbags. If something is wrong with these systems, they will usually display a code that indicates the issue. This code is stored in the system and will stay there until the problem is fixed. inquiry could mean that the on-board computers to be replaced.
One of the main causes of the airbag light turning on is the loose or corroded connections in the airbag sensor. This could be due to wear and tear, aging, or exposure to moisture and salt. It is important to have this issue addressed as quickly as possible, since an airbag that is not functioning properly could be dangerous in the event of an accident.
If you find a card not found error on your Peugeot key fob, the battery inside the key fob might be weak or dead. This could prevent the key fob from transmitting a signal that will disable the immobilizer on your vehicle's standard. Test this by pressing the unlock button on the fob's key and then trying to start your vehicle. If this doesn't work, then the key battery needs to be replaced.