2015 LEXUS GS 350 Engine Problems

I PURCHASED MY VEHICLE 2018 AND WITHIN APPROX. A MONTH I WAS INVOLVED IN AN ACCIDENT ON THE FREEWAY WHERE MY VEHICLE STALLED WHICH RESULTED IN MAJOR DAMAGES TO MY CAR . I COULDN'T EXPLAIN WHAT HAPPENED BECAUSE I DIDN'T KNOW AT THE TIME. PRIOR TO THE ACCIDENT I SPOKE TO THE DEALERSHIP AND REPORTED THAT THE CHECK ENGINE LIGHT WOULDN'T TURN OFF AND HE STATED IT PROBABLY NEEDED TUNEUP . CAR FELT ROUGH. ACCIDENT RESULTED IN VEHICLE REPAIR AND ME W/O A CAR. THE AIR BAG DID NOT DEPLOY, ENTIRE FRONT CAR SMASHED IN. AFTER VEHICLE WAS RESTORED ENGINE LIGHT AND TIRE PRESSURE LIGHTS REMAIN ON , HAD TO TAKE CAR TO LEXUS DEALERSHIP (NORTH PARK) WHERE IT WAS MAINTENENCE. WHEN I PICKED IT UP CAR SOUNDED STRANGELY LOUD AND AS I WAS DRIVING OFF THE CAR STALLED AGAIN. NOBODY WAS AVAILABLE TO HELP ME AND I ENDED UP...