When you activate this mode, your standard radio, navigation, and climate controls are replaced with raw telemetry data. This is not a "tuning" tool (it won’t increase horsepower), but it is a goldmine for diagnostics.
: Required for newer IVI systems (found in 2024+ models like the 2008 II). How to Access Engineering Mode Engineering Mode Peugeot 2008 Code
If 8555 does not work, try the classic PSA (Peugeot/Citroen) engineering code: . When you activate this mode, your standard radio,
system, the entry methods are becoming increasingly locked down. PSA (now Stellantis) has begun moving toward "over-the-air" (OTA) updates, which reduces the need for manual code entry but also further obscures the car’s internal workings from the owner. Conclusion How to Access Engineering Mode If 8555 does
: Press and hold the physical or on-screen "Media" or "Radio" button for 5–10 seconds until the keypad appears.