Car sales fraud?

Hi people once have a question a known has sold his car. Since it is a hobby vehicle it was sold naturally reduced in value. But now the new owner sells the vehicle profitably without announcing the defects or even under completely false facts. We know this because the car was advertised the next day. And the description absolutely does not fit the car or. these so-called conversion works are partly not possible with this vehicle and can not pass within 12 hours or 24 hours ;-). Besides, the car is now in a completely different state when the seller said where he lives. Well now my question can be legally done right now? or you have to wait until a poor seller buys this vehicle and then comes up with it.? We have hald consider since we all incl. the acquaintance do not want that at some point the vehicle meets the acquaintance again in a court act. … He sold it with a good conscience… Possibilities? lg Tippay