A Brief History Of Peugeot Keys In 10 Milestones
Peugeot 208 Key Replacement
Peugeot 208 key replacement is best left to auto locksmiths with experience with the right equipment and technical know-how. They can make and program new keys much quicker than a dealership and at a lower cost.
If your key fob stopped locking or unlocking your doors it could be due to a dead battery in the coin. There are other possibilities that the key is malfunctioning.
Dead Coin Battery
A dead coin battery can hinder your Peugeot 208 from locking or unlocking and cannot start the engine. In this scenario, you will need to employ the alternate method of starting as described in your vehicle's owner's manual.
Another reason the 208 won't start is that the spark plugs have been worn down. The spark plugs light the fuel to start the engine. They have a limited life span. They will eventually break down if they're not used enough.
Luckily, there's an easy solution for this issue. The best thing to do is to measure the voltage of your car battery using 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 covers off the two battery terminals and then using a wirebrush to clean any corroded parts of the battery. Then, you should reconnect the positive pole cables to the negative.
Water Damage
If your 208 will not start and the battery hasn't failed, you should inspect the spark plugs. It is possible that they're dirty, which causes them not to spark. This can be fixed easily by cleaning the spark plugs in a workshop.
Peugeot cars have keys that are transponder-type and works with the car's immobiliser system. This ensures 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.
Water damage is a common reason for this issue. This is a typical issue in areas with colder temperatures where the vehicle is exposed to rain or snow. In this situation, contact a reputable locksmith who has the tools and equipment required to modify the key. They will also have all the latest technology and equipment needed to make the Peugeot smart key. The process shouldn't last more than 15 minutes.
Contacts to the battery are not working properly.
Peugeot changed from the old carbon encased transponder chips to an entirely new type of chip that relies on electronic components in circuit boards. The new system is effective when it's brand new but over time the circuit boards start to degrade and stop working correctly.
This can stop the immobiliser from activating so your vehicle won't be able to start. Contact a Peugeot specialist, or a locksmith if this is the situation.

Another issue that is common is when the battery of the key fob is dying, this causes the blade of the key to stop from entering the lock. A locksmith from your car will replace the battery, and then cut a new key blade for you. This is a quick solution.
Faulty Receiver Module
It could be that the receiver module is faulty if your Peugeot key fob isn't working after being dropped on the floor, or exposed to a sudden storm or accidentally washed. The receiver module is responsible for transmitting radio frequency to the onboard computer that manages the central locking system of your Peugeot vehicle.
Rubber seals on the key fob stop water from reaching its electronic chip. However prolonged exposure to water could be able to penetrate these seals and cause damage to the chip. Submerging the key fob into the ocean at the beach or throwing it into the water can be particularly damaging due to the high salt content.
The module must be replaced if the Peugeot spare key isn't working anymore. This can only by done by a Peugeot specialist or a professional auto locksmith. Peugeot keys, unlike other cars, are secured by an immobilizer device. This requires the proper code to begin the car. This is the reason why you should only choose a reputable Peugeot locksmith for the job of designing and programming an appropriate replacement.
Computer with a problem on board
The on-board computer in your Peugeot is the one responsible for all of the systems inside your vehicle, from power windows to the airbags. If something goes wrong with these systems, it will typically show a code that identifies the issue. This code will be saved in the system until the issue is fixed. Often, this will involve replacing the computer on board.
The most common reason for the warning light for airbags to flash 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 resolved as soon as you can, as an airbag that is malfunctioning can be dangerous in the event of an accident.
If your Peugeot is showing a card not detected error then the key battery in the key fob could be dead or weak. This will prevent the key fob from sending a signal that disables the immobilizer on your vehicle's standard. peugeot 107 key fob G28 can test this by pressing the unlock button on the key fob and then trying to start your vehicle. If this does not work then the battery on the key needs to be replaced.