Peugeot 308 Secret Menu -

Confidential Technical Report: Peugeot 308 Hidden/Secret Menu Access

Subject: Access methods, functionality, and risks of the dealer diagnostic/hidden menu on Peugeot 308 vehicles (Focus on T9 Generation 2013–Present).

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Some menus allow you to toggle a "Demo Mode" for the navigation system. Safety First: Words of Caution Ensure the vehicle ignition is on (engine running

Keep holding until it shows "=0" and the spanner disappears. MK3 Generation (2021–Present): presenting a list of options.

Think of it as the "Task Manager" or "BIOS" of your car’s computer. It bypasses the pretty animations and rounded corners to show you raw data: voltages, GPS coordinates, antenna signal strength, RAM usage, and component test outputs.

1. Ensure the vehicle ignition is on (engine running or accessory mode).
2. Locate the audio control buttons on the steering wheel (typically the right-hand satellite).
3. Press and hold the "Mode" button (often labeled with a speaker icon or the word 'Mode') for approximately 10 seconds.
4. Release the button when the main screen flickers or enters a white-screen test mode.
5. Immediately press and hold the "Volume Up" (+) button or the "Source" button.
6. A white diagnostic screen with red text should appear, presenting a list of options.