Selling old piles of junk ..Dangers?

Hello I tried to search the board, but unfortunately I did not find the right search terms, because actually I am sure that there should already be something to do with it… would like to sell my old (13years 183tkm). Unfortunately I did not care for the car (I was young and stupid) and the car is quite down (lacquer, exterior mirror plastic bleached, glove compartment defective, exhaust rusted through etc. TÜV runs out soon) , but has otherwise hardly rust and runs actually still g ut. I bought a used car now, but the dealer had no interest in the car (50Eur Schrottwert would have been feasible), so now my question: I have every two days plastic visa cards of mostly southern car dealers hanging on the car, which allegedly buy everything… According to the DAT list, the car would have a purchase value of 1600Eur in better condition, I would have to remove the defects there actually still 100-200Euro maybe even a bit more in it… …must ic h with such a sale notice anything? Do I have to guarantee for a car without TÜV as a private person? Can I get any trouble after a completed sale in any other form and if yes: are there ways to protect against it? … because I would actually find the thought quite comforting that my poor wounded companion may perhaps see Africa again or so 😉 …. Thanks for tips!