Peugeot 208 Key Replacement
It is better to leave the replacement of Peugeot keys for 208 to auto locksmiths that have the required equipment and skills. They can create and program new keys quicker than a dealership and at a lesser cost.
A dead coin battery is most likely to blame when your key fob stops locking or unlocking doors. There are other reasons for the key to be malfunctioning.
Dead Coin Battery
A dead battery can stop your Peugeot 208 from locking and unlocking, as well as stopping it from starting the engine. If this is the case, you'll need to utilize the backup starting method which is explained in the owner's manual for your vehicle.
The spark plugs might also be worn out. The spark plugs light the fuel to start the engine. They have a limited lifespan. If they aren't used enough, they will eventually fail.
Luckily, there's an easy solution to this problem. Verify the voltage of your battery using a multimeter. If it's lower than 11.5 volts it is time to replace it. It is also essential to clean the contacts of the battery when it has corrosion. You can do this by lifting the rubber covers that cover both battery terminals and using a wire brush to remove any parts that are corroded from the battery. You should then reconnect the cables for the positive and negative poles.
Water Damage
If your 208 does not start and the battery has not failed, you should examine the spark plugs. You may find that they are simply too filthy and don't spark. This is easily fixed by cleaning the spark plugs in an workshop.
Peugeot cars are equipped with a transponder key that works with the car's ignition system. This makes sure that only the correct key is able to turn the engine. If the chip in the Peugeot key is damaged then it will not send the proper signal to the vehicle.
Water damage is a frequent cause of this problem. This is a common problem in colder climates where the vehicle has been exposed to snow or rain. If this is the case, seek out a reputable auto locksmith who will have all of the equipment and tools needed to reprogram the new key. peugeot car keys g28carkeys.co.uk will also have the latest technological know-how and machinery required to make the Peugeot 208 smart key. The process should take no more than 15 minutes.
Contacts with the battery may be damaged.
Peugeot replaced the transponder chips by introducing a new model that is based on electronic components mounted on a circuitboard. This new technology works great when it's brand new but over time the circuit boards start to deteriorate and stop working properly.
This can stop the immobiliser from activating so your vehicle will not start. If this is the case, it's a good idea to call a Peugeot specialist or locksmith.

A common issue is when the battery inside the key fob starts to die. This causes the blade of the key to stop feeding into the lock. A locksmith from your car will replace the battery, and cut a new blade for you. This is a simple fix.
Faulty Receiver Module
If your Peugeot key fob was not working after dropping it on the ground, being exposed to a sudden rain or accidentally washing it may be due to a faulty receiver module. The receiver is responsible for transmitting radio frequency signals to the on-board computer that controls the central locking system within your Peugeot vehicle.
Rubber seals on the key fob stop water from reaching the electronic chip. However, prolonged exposure to water may penetrate these seals and damage the chip. Submerging the key fob into ocean water on 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 then you'll have to get the module replaced. This can only by done by a Peugeot specialist or an expert auto locksmith. Peugeot keys unlike other automobiles, are secured by an immobilizer system. This requires the right programming to allow the car to start. This is why it is imperative that you should only rely on an authorized Peugeot locksmith to design and program an alternative.
Faulty on-Board computer
The on-board computer in your Peugeot is responsible for a variety of systems inside your car, including airbags and power windows. If something goes wrong with these systems, it will usually display a code that indicates the issue. The code is stored within the system and will stay there until the issue is solved. Often, this will involve replacing the on-board computer.
The most common reason for the warning light of the airbag to turn on is corrosion or loose connections within the sensor. It can be due to wear and tear, ageing or exposure to moisture and salt. It is essential to have this issue addressed as soon as you can, as the airbag malfunctioning could be dangerous in the event of an accident.
If your Peugeot is showing a card detected as not present error, then the key battery inside the key fob could be dead or weak. This will stop the key fob from sending a signal that will disable the immobilizer on your vehicle. Try this by pressing the unlock key on the fob's key, then trying to start your car. If this fails it is because the battery of the key is in need of replacement.