The "secret menu" in a Peugeot 308 (often referred to as the Expert Menu or Service Menu) is a hidden diagnostic tool used by technicians to check software versions, hardware serial numbers, and system temperatures. Depending on your car's generation (T7 vs. T9) and infotainment system (SMEG, NAC, or RCC), the way to access it varies. How to Access the Hidden Menus
Applicable to: Earlier 308 models (T7) or models with smaller non-touch navigation screens.
Once inside, you will see a list of options. Here is what the most common entries actually do: peugeot 308 secret menu
For 2014-2016 models known for screen degradation:
A screen labeled "Expert Mode" or "Engineering Menu" should appear. This menu provides detailed GPS satellite data, internal temperature of the head unit, and voltage readings. What Can You Do in the Secret Menu? The "secret menu" in a Peugeot 308 (often
This opens up the system diagnostics, module parameters, and screen calibration cheats. ⚠️ A Quick Word of Warning
Two of the most sought-after "secrets" are actually found in a different hidden menu—the Dealership Telecoding Menu. How to Access the Hidden Menus Method B:
While the menu is "read-only" regarding critical engine mapping, improper use can lead to system instability.
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