!new! | Smart P2403.40h

: Features such as lane-keeping assist, adaptive cruise control, and automatic emergency braking are becoming standard in many new vehicles. These systems utilize a combination of sensors, cameras, and radar to assist drivers in avoiding accidents.

In Smart cars—especially the Smart Fortwo (450, 451, and 453 build series) and Smart Roadster—this exact code sequence can trigger limp-home modes, transmission locks, and the infamous "three lines of death" on the dashboard. Anatomy of the Diagnostic Code smart p2403.40h