OWNER DROVE VEHICLE TO WORK AND NOTICED IT STARTED SMOKING. DROVE BACK HOME AND WENT INSIDE TO CALL AND HAVE VEHICLE TOWED. HE DID NOT GO BACK OUT TO THE VEHICLE UNTIL LATER IN THE EVENING, WHEN HE FOUND THE WINDOWS GRAY FROM SMOKE AND THE INSIDE OF THE VEHICLE WAS PARTIALLY MELTED BECAUSE IT CAUGHT FIRE. CATALYTIC CONVERTER LIGHT CAME ON SEVERAL DAYS PRIOR TO THE FIRE. FIRE DAMAGE LIMITED TO FLOOR BELOW CENTER FRONT OF DASH, ABOVE CATALYTIC CONVERTER AND EXHAUST SYSTEM.