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How to Solve Common Issues with an Electronic Key on a Peugeot 308

Model: Peugeot 308 P5, MK 3 - Years 2021-2026
Part: Key

Issues with the electronic key of the Peugeot 308 are generally solvable with a few adjustments. The most common symptom is a reduced range of the remote or the warning "key battery low" appearing on the dashboard. A healthy battery should last between 2 and 4 years. Simply replace the battery, which is a standard CR2032 (a straightforward task you can do yourself). It may happen that the system does not recognise the key, even if the battery is new. In this case, an error message will appear on the display. However, the Peugeot 308 is equipped with an emergency start system. Bring the electronic key close to the dedicated reader, usually located in the centre console (under the armrest or in front of the gear stick). With the key in this position, press the START button to start the engine. This system works even if the key battery is completely flat, as the key communicates via a passive chip. If you lose a key, it is always useful to remember that you have a second spare provided with the car. Losing both keys is the most complex situation. The only solution is to contact a Peugeot Network (official dealer). You will need to: deactivate the code of the lost key to prevent it from being used by others. Other issues that may arise include: oxidised contacts: sometimes it is enough to clean the battery contacts or inside the key; flat car battery: a low onboard voltage can cause various malfunctions, including failure to recognise the key.

Posted on 19 June 2026 by ScegliAuto

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On the Peugeot 407, the boot may become stuck, possibly due to a problem with the control button or the lock actuator. In such cases, you can perform an emergency opening by following the simple procedure shown in this tutorial. First, open the rear doors, then lower the seat back by operating the release lever. Next, go inside the boot, locate the lock, and manually operate it using a flathead screwdriver. The boot will then be free to open.

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