Adaptive Equipment problems of the 2000 Volkswagen Passat

Heat shield caught fire while driving down the road. I had bought the car from carmax who had lied about the auto from the broken seatbelts forward on the day of sale. Vw dealership repaired auto after fire but another mishap with heatshield when it fell off and under the passenger front tire @ 65 mile per hr, while driving down turnpike. I was not injured thanks to a truck driver who assisted my navigation to the side of the road and cut off the shield so I could return home. The tie rod was damaged and had to be replaced, since the fire the car has never been the same and has been a hazard, stalling on a beltway, etc. . . No apparent reason for this was found on a diagnostic machine as it has been checked several times. . It is when the emission light comes on and a bad sensor needs replaced or switch. But nothing fixes this car for long.