He/she is called a car dealer.
basls
Motorist.
You would call that forgery on a black market and the person selling it a con artist.
A car collector?
RICH
A car mechanic.
Mechanic
You can try selling your classic car on websites like Kijiji or Autotrader. You can also try networking at car shows and selling your car to a person there.
Usually you will be buying from people who make a living selling cars then finding used ones and selling again for profit. This will generate decent working vehicles if you are buying from a person who is serious about income. Generally, yes, these cars are fine.
Body man, auto body technician,
by people selling them
an automotive mechanic