If you use the technology of other brands and models of cars, of course there is no patented technology.
If you develop it yourself, it will be much more. For example, you can work hard on the door and invent a new type of door lock and anti-theft
From the chair, you can invent a comfortable seat. From the quality of the seat, you can invent a steering wheel that is not afraid of cigarette burns. You can have a massage. .................
really a lot It depends on whether you can invent it.
As long as you apply for it, it's all patents.