Peugeot 208 Key Replacement
Peugeot 208 key replacement should be left to experienced auto locksmiths with the right tools and know-how. They will be able to create and program new keys 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 coin battery. There are other causes that the key could be malfunctioning.
Dead Coin Battery

A dead battery can stop your Peugeot 208 from locking and unlocking, and also making it impossible to start the engine. If this is the case, you'll need to use the backup starting method that's described in the owner's manual for your vehicle.
The spark plugs could also be worn out. The spark plugs are responsible for instigating the fuel that powers the engine. However they are limited in their time of life. If they aren't used enough they will eventually fail.
There is a simple solution to this problem. Check the voltage of the battery using a multimeter. If it's lower than 11.5 volts and you are not satisfied, then it is time to replace it. If the battery is damaged it is crucial to clean its contacts. This can be done by removing the rubber covers from the two battery terminals, and then using a wirebrush, you can remove any corroded battery parts. Then, you must reconnect the positive pole cables to the negative.
Water Damage
If your 208 doesn't start and the battery isn't flat, then you need to make sure that the spark plugs work. It is possible that they're filthy, making them unable to spark. This is easily fixed by cleaning the spark plugs in an workshop.
Peugeot cars have a transponder key that works with the car's ignition system. This guarantees that only the right 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.
This is a very common issue that can occur due to water damage. This is most common in colder climates, where the vehicle could have been exposed to snow or rain. In this instance, you should contact a reliable locksmith who has the tools and equipment needed to change the key's programming. They will also have the latest technology and machinery needed to create the Peugeot smart key. The process shouldn't be more than 15 minutes.
Contacts to the battery are not working properly.
Peugeot changed from the carbon-encased transponder chips to a new type of chip that relies on electronic components within circuit boards. replacement peugeot key g28carkeys.co.uk works great when it's brand new however, over time, the circuit boards begin to deteriorate and stop working correctly.
This can stop the immobiliser from working, so your vehicle won't start. Contact a Peugeot specialist or a locksmith if this is the situation.
Another common issue is when the battery in the key fob gets depleted, which causes the blade of the key to stop from entering the lock. A locksmith in your car will replace the battery and then cut a new blade for you. This is a quick fix.
Faulty Receiver Module
It could be that the receiver module is defective if your Peugeot key fob doesn't work after being dropped on the floor, or exposed to a sudden storm or accidentally washed. The receiver module is responsible for transmitting radio signals to the onboard computer that regulates the central locking system of your Peugeot vehicle.
The rubber seals on the key fob stop water from getting to the electronic chip. The chip can be damaged by water when it is exposed to the water for an extended period of period of. The high salt content of the pool or ocean water could cause damage to the key fob if it is submerged.
The module will need to be replaced if your Peugeot spare key isn't working anymore. This is only done by an Peugeot specialist or an expert auto locksmith. Peugeot keys, unlike other cars, are secured by an immobilizer device. This requires the proper coding to start the car. This is why it is imperative that you should only trust a Peugeot locksmith to create and program a replacement.
Faulty on-Board computer
The computer on board in your Peugeot is responsible for a number of the systems in the car, from power windows to the airbags. The on-board computer displays a code when something goes wrong. This code will be stored within the system until the issue is resolved. Usually, this will mean the on-board computer being replaced.
The most frequent cause for the warning light of the airbag to turn on is corrosion or loose connections in the sensor. This could be due to wear and tear, age or exposure to salt and moisture. This issue should be addressed as soon as you can, as an airbag that is not functioning could be dangerous in the event of an accident.
If your Peugeot is showing a card detected as not present error, the battery in the key fob may be weak or dead. This will stop the key fob sending a signal to disarm the vehicle's immobilizer. Try this by pressing the unlock key on the key fob, and then trying to start your car. If this doesn't work it is because the battery of the key is in need of replacement.