Mercedes PRE SAFE System Explained: How It Works, Functions & Common Issues Modern Mercedes-Benz vehicles are equipped with PRE-SAFE®, an intelligent anticipatory safety system designed to prepare the vehicle and its occupants before a collision occurs. Unlike traditional safety systems ...
Quick answer “Radar Sensor Dirty” (or “Currently Unavailable — Radar Sensors Dirty”) means the front radar sensor (A108) is blocked, misaligned, or has lost calibration — causing Active Brake Assist, Collision Prevention Assist Plus, and Adaptive Cruise Control to deactivate. ...