This applies to most second-generation Peugeot 308 models (T9 chassis, roughly 2013–2021) equipped with physical toggle or piano-style keys beneath the touchscreen:
Keep holding until it shows and the spanner disappears. MK3 Generation (2021–Present): peugeot 308 secret menu
| Feature | OBD2 Scanner (ELM327) | Peugeot 308 Secret Menu | | :--- | :--- | :--- | | Engine Fault Codes | Yes | Yes (Basic) | | ABS / Airbag Codes | Expensive models only | No (Menu only shows infotainment/BSI) | | | No | Yes | | GPS Signal Strength | No | Yes | | Radio Antenna Test | No | Yes | | Real-Time Battery Voltage | Yes (with ignition on) | Yes (with ignition off) | This applies to most second-generation Peugeot 308 models
Unlock access to advanced vehicle diagnostics, system information, and hidden settings on your Peugeot 308 by leveraging the infotainment system's built-in hidden menus. The secret menu reveals a 7-band parametric equalizer
The existence of this menu serves two primary purposes for the independent mechanic or advanced DIY enthusiast:
Standard users get a basic bass/treble slider. The secret menu reveals a 7-band parametric equalizer.
Before attempting to update your maps or CarPlay/Android Auto settings, you need to know your exact firmware build. The secret menu provides the long-form version number (e.g., 5.43.A.R2) that isn't visible in standard settings.