Peugeot 308: Secret Menu

Because several of these functions (engineer mode, BSI reset, forced DPF regeneration) can be dangerous or responsibility-intensive. Dealers prefer you bring the car in for diagnostics.

Once inside, the following diagnostic categories are typically available:

| Menu Name | Information Provided | |-----------|----------------------| | Vehicle Parameters | Live CAN bus data: coolant temperature (in °C), battery voltage, fuel pressure, instantaneous fuel consumption (digital). | | GPS Info | Number of satellites in view, HDOP (horizontal dilution of precision), latitude/longitude, GPS time. | | Screen / Display Tests | LCD color bars, dead pixel detection, backlight test, touchscreen crosshair calibration. | | Audio Test | Speaker phase, left/right/fader balance test tones, amplifier status. | | Version Information | Exact part numbers, hardware revision, software version, map version (for navigation units), Bluetooth stack version. | | ECU List | List of all electronic control units (BSI, ABS, BSI, etc.) and their communication status (OK/NO COMM). | | Vehicle VIN | Displays the stored VIN – useful for verifying configuration. |

Once you are inside, you will be greeted by a monochrome, text-heavy interface. Do not panic. Use the volume knob to scroll and the "OK" button to select. peugeot 308 secret menu

Here are the five most useful sections of the Peugeot 308 secret menu.

If successful, the screen will transition to a blue or black background with engineering text, labeled "Personalization – Configuration" or similar.

The new system is Android-based. To access its hidden diagnostic portal: Because several of these functions (engineer mode, BSI

Steps:

Hidden Features Here:

Note: exact button sequences vary by year and infotainment generation (e.g., SMEG/RT6, SMEG+, MirrorScreen/Android Auto-capable units). The sequences below are widely reported, but may differ by model year. Once you are inside, you will be greeted

The secret menu is a low-level diagnostic interface built into your infotainment system. It is primarily used by engineers during production and by dealership technicians to quickly verify system health.

In the automotive world, this is often referred to as the "Engineering Menu" or "System Information Menu." On the Peugeot 308, it resides within the SMEG or NAC/Wave 4 infotainment systems.

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.