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Peugeot 208 Key Replacement
It is best to delegate the replacement of Peugeot 208 keys to auto locksmiths that have the equipment and expertise. They will be able to make and program new keys much quicker than a dealership and at a lower price.
If your key fob stopped locking or unlocking your doors it is likely due to a dead coin battery. There are many other reasons for the key to be malfunctioning.
Dead Coin Battery

A dead coin battery will stop your Peugeot 208 from locking and unlocking, as well as preventing it from starting the engine. In this instance you'll need to use the alternative starting method found in your vehicle's owner's manual.
The spark plugs could also be worn out. Spark plugs are what ignite the fuel to start the engine. They have a limited lifespan. They'll eventually degrade if they aren't used frequently enough.
Luckily, there is an easy solution to this issue. The best way to solve this issue is to test the voltage of your car battery with a multimeter. If it's below 11.5 Volts then you must replace it. It is also necessary to clean the contacts of the battery in the event that it is damaged by corrosion. This can be accomplished by removing the rubber cover from the two battery terminals, and then using a wirebrush to clean any damaged parts of the battery. Then, you should connect the cables that connect the positive and negative poles.
Water Damage
If your 208 doesn't start and the battery hasn't failed, you should look at the spark plugs. It could be that they're dirty and they don't spark. This is easily fixed by cleaning the spark plugs in an workshop.
Peugeot automobiles use a key with a transponder compatible with the immobiliser. This ensures that only the correct key is able to start the engine. If the chip in the Peugeot key is damaged then it won't send the correct signal to the vehicle.
Water damage is a typical reason for this issue. This is particularly prevalent in colder climates where the vehicle might have been exposed to rain or snow. In this case, you need to contact an experienced locksmith who has the tools and equipment required to change the key's programming. They'll also have the latest technology and machinery required to make the Peugeot smart key. The process shouldn't take more than 15 minutes.
Contacts to the battery are not working properly.
Peugeot replaced the old transponder chips with a new model that is based on electronic components that are mounted on a circuit board. The new system is great when it's brand new, but the circuit boards degrade over time and cease to function properly.
This can stop the immobiliser chip from activating which means that your car won't start. Contact an Peugeot specialist, or a locksmith if this is the case.
A common issue is when the battery of the key fob starts to fail. This causes the blade of the key to stop feeding into your lock. A car locksmith will replace the battery, and then cut a fresh blade for you. This is a quick fix.
Faulty Receiver Module
If your Peugeot key fob stopped working after dropping it on the floor, being exposed to a sudden downpour or accidentally washing it may be due a malfunctioning receiver module. The receiver module is responsible for transmitting radio signals to the onboard computer that controls the central locking system of your Peugeot vehicle.
The key fob itself has rubber seals to prevent water from getting to the chip inside. The chip can be damaged by water when exposed to water for long periods of time. Submerging the key fob into sea water at the beach or throwing it into the water can be especially damaging because of the high salt content.
If your Peugeot spare key fob stops working then you'll have to get 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 code to begin the engine.
peugeot 207 key is the reason why you should only go with a knowledgeable Peugeot locksmith to take on the job of programming and creating a replacement.
Computer on board is not working properly
The computer on board in your Peugeot is responsible for a number of the systems within your car, ranging from power windows to airbags. When something goes wrong in these systems, it will usually show a code that identifies the problem. This code will be stored in the system until the problem 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 within the sensor. This can be caused by wear and tear, age or exposure to salt and moisture. It is important to have this issue resolved as soon as you can, since an airbag that is malfunctioning can be dangerous in the event an accident.
If you notice an error message that says "card not found" on your Peugeot, the key battery inside the key fob may be dead or weak. This will stop the key fob sending a signal that will disable your vehicle's immobilizer. You can test this by pressing the unlock button on the key fob and then trying to start your vehicle. If this fails it is because the battery of the key must be replaced.