Just to save you trawling through myriad posts, pertinant to this type of scam on this forum, I will give you a broad outline( of one way,it can go).........
You recieve an authentic looking cheque/draft for more than the asking price.
You lodge same.
You are then contacted, "apologising" for his mistake in sending an amount larger than the price of the car and could you please return the "excess".
You do, and lo and behold, his cheque bounces!! You are now out of pocket.
This one is in its simplest form, and if a fiduciary agent is involved it can get a lot more complicated, or "slicker", whichever you prefer.
You have been warned, but of course, you do have to take heed.
Here is a little reading for you.
Keep us posted........