VARIOUS PROBLEMS INVOLVING 2000 MERCEDES BENZ ML320 / ALSO AIR BAGS FAILED TO DEPLOY.*MR CONSUMER WAS STRUCK BY ANOTHER VEHICLE CAUSING DAMAGE TO BOTH SIDES OF THE VEHICLE. ALL THE DOORS WERE SMASHED IN YET NONE OF THE SIX AIR BAGS DEPLOYED. IN ADDITION, THE CHECK ENGINE LIGHT ILLUMINATED WHILE DRIVING. VEHICLE HAS BEEN TO THE MECHANIC MANY TIMES FOR REPAIRS BUT TO NO AVAIL. CONSUMER FELT VEHICLE MAY BE DEFECTIVE AND WOULD LIKE TO EXCHANGE OR GET MONEY BACK. *PH