Car Model 1

This is my first car model, it has a different front (parrilla), three details on the truck, side lights and in the down part of the truck it has a fixed exhaust in order to appear more intrepid.When I exported the car to an .stl file and analized it on visCam view, it appeared to has many errors as different normal directios in almost all the surfaces but parts of the door and lateral mirros, and there are unmatched edges as we can see with the yellow lines.