2008 BMW 535XI Unknown Or Other Problems

WEDNESDAY JULY 25TH, 2018, AS I WAS GETTING READY TO LEAVE WORK, I STARTED MY CAR WHICH WAS PARKED IN MY COMPANY'S UNDERGROUND GARAGE AND THE INTERIOR BECAME ENGULFED WITH SMOKE. I TURNED THE CAR OFF AND GOT OUT TO CHECK THE ENGINE. THERE WAS NO SMOKE COMING FROM THE UNDER THE HOOD OF THE CAR. I GOT BACK INTO THE CAR AND STARTED IT AGAIN AND MORE SMOKE ENTERED INTO THE CAR. I TURNED THE CAR OFF AND WENT BACK TO MY OFFICE TO CALL AAA. APPROXIMATELY 20-30 MINUTES LATER I WENT BACK TO THE CAR AND IMMEDIATELY SMELLED SMOKE IN THE GARAGE. AS I APPROACHED THE CAR IT WAS COMPLETELY FILLED WITH SMOKE BUT I COULD TELL THAT THE BOTH THE BACK AND FRONT WINDOW SHIELDS AND THE SUNROOF WERE SCORCHED. MY KEY FOB DID NOT WORK SO I HAD TO OPEN THE CAR WITH THE KEY. WITH...

AT C. 89,000 MILES - WARNING: "DRIVER SIDE AIR BAGS MALFUNCTION". BMW DEALER, ROCKVILLE, MD, WANTS $660 TO TELL ME IF IT'S A REAL PROBLEM WITH THE BAG, AND/OR ITS HOUSING AND/OR ONLY A FAULTY SENSOR SENDING AN INCORRECT MESSAGE (!!) FOLLOWING THAT SUSPICIOUS DRILL THEY CAN THEN FIX IT - A COUPLE HUNDRED DOLLARS IF IT'S ONLY A SENSOR, MUCH MORE $ IF IT'S SOMETHING ELSE. CAR MOVING OR NOT, THE WARNING REMAINS ON.