The purpose of this part is to ensure that motor vehicles and motor vehicle equipment permanently imported into the United States conform with theft prevention standards issued under part 541 of this chapter and that they conform with, or are brought into conformity with, all applicable Federal motor vehicle safety standards issued under part 571 of this chapter and bumper standards issued under part 581 of this chapter. The purpose of this part is also to ensure that nonconforming vehicles and equipment items imported on a temporary basis are ultimately either exported or abandoned to the United States.