Sucked off by car dealers

Hello, already in advance sorry for the OT, find unfortunately not the right area. It is about, 2 months ago from a “dealer” bought us a Hyundai Coupe, he then arrived at the purchase contract to which he gives no guarantee at the low price (2000€). Well, the car looked otherwise good, (rust and from inside) had also only one previous owner, and only 90,000 KM on the clock, so we took it nevertheless. Last week then came the evil, on the way the wagon caught In the workshop it was only the engine that went down, the piston is broken by the engine. Total damage. At the beginning of the week then the dealer who sold us the W203 told us first of all that what the dealer did there was illegal, he is always obliged to give warranty, no matter whether cheap, hobbyist car, etc. Now to the question, has since possibly already someone experience what it would look like if I was lawyer against the Hän have 2000€ or not. Thank you very much for any tips and advice.