2018 BMW 440I Unknown Or Other Problems

My husband bought a BMW through the military sales program, had it delivered to the United States, and we took it with us to Germany where we currently live. The car is made to U.S. specifications and I had been driving the car weekly in Germany to keep the battery running while he is away on a deployment. On April 11, 2022, as soon as I pressed the ignition button, the dashboard flashed a strange indicator light which I didn't have time to examine because my attention was immediately diverted when a metal bar next to the right rear headrest deployed from inside the seat and punched through the windshield. It sounded like someone threw a brick into the car. The check engine indicator also lit up but deactivated after a few minutes. According to the owner's manual, the metal bar is one of a set of two rollover protection...

I HAVE DRIVEN THE CAR NOW ABOUT 900 MILES. AT NO TIME HAS THE FRONT END COLLISION/PEDESTRIAN WARNING SYSTEM GIVEN ME ANY WARNING EVEN THOUGH I HAVE NEARLY REAR-ENDED THE CAR AHEAD AND EVEN THOUGH I HAVE IT SET FOR THE EARLIEST WARNING POSSIBLE. BMW N.A. ASSIST CUSTOMER CARE STATES THAT I SHOULD RECEIVE BOTH VISIBLE AND AUDIBLE WARNINGS BUT ALSO STATES I HAVE TO RELY ON WHAT DEALER SAYS. THE DEALER- DREYER & REINBOLD - STATES THE SYSTEM IS WORKING AS IT SHOULD. THIS CANNOT BE TRUE. SINCE MY 2015 BMW 535I HAD A PROPERLY WORKING FRONT END COLLISION WARNING THAT FREQUENTLY APPEARED ON MY INSTRUMENT PANEL AND HEADS-UP DISPLAY, I KNOW HOW THE SYSTEM IS SUPPOSED TO WORK. THE CURRENT CONDITION OF MY VEHICLE CREATES A SERIOUS SAFETY HAZARD AND I DON'T KNOW WHERE ELSE TO TURN. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA),...