2009 VOLVO S40 Engine Problems

MY WIFE WAS DRIVING HOME FROM A GROCERY STORE 3 MILES AWAY. A QUARTER MILE FROM THE HOUSE SHE NOTICED A BURNING SMELL. SHE THOUGHT IT WAS FROM THE OUTSIDE SINCE BRUSH FIRES ARE COMMON AROUND SOUTH FL. SHE PARKED ONTO OUR DRIVEWAY AND NOTICED SMOKE RISING FROM AROUND THE HOOD. SHE TOOK THE KEY OFF OF THE IGNITION AND THE ENGINE KEPT RUNNING. SHE CALLED THE FIRE DEPARTMENT WHILE A NEIGHBOR HELPED AND OPENED THE HOOD. IMMEDIATELY SMOKE STARTED BILLOWING AND THEY OBSERVED FIRE IN THE ENGINE.TWO FIRE ENGINES SHOWED UP AND CONTAINED THE FIRE BEFORE DOING ANY FURTHER DAMAGE. MOST OF THE VISIBLE DAMAGE IS BETWEEN THE AIR INTAKE MANIFOLD AND THE AIR FILTER HOUSING. ON THAT DRIVE NO WARNING LIGHTS CAME ON, THE CAR RADIO WAS WORKING MY WIFE SAID IT WAS UNEVENTFUL UNTIL THE SHE NOTICED THE SMOKE. MY WIFE WAS SCARED AND STRESSED BEYOND ANYTHING...