Mercedes Stop-Start System Not Working: Causes, Conditions & Fixes (Case Study in A-Class) If your Mercedes ECO Start-Stop system has suddenly stopped working, you’re not alone. Although designed to save fuel and reduce emissions, this feature often becomes inactive when ...
Quick answer “Collision Prevention Assist Plus Inoperative” means the Mercedes radar-based automatic emergency braking system has detected a fault and shut itself down. The most common causes — in workshop order — are: dirty or misaligned radar sensor, weak auxiliary ...