Private Sale Arglist Deception Rights Seller

I sold my 17-year-old VW with a mileage of approx. 217000km, pointed to certain defects (I am not an expert) and meant he should come through the TÜV without major problems. the buyer made a test drive and looked at the vehicle. In the contract of mobile.de stood, the sale is under exclusion of material defects liability. Now the new owner sent me an estimate of the cost of his VW-Autohaus-Werkstatt with a horenten sum, and demanded from now the purchase price refund, because he did not expect such high TÜV costs and now makes me responsible. on the cost estimate there are among others positions like HU-main investigation, dekra service, inspection, oil change, … I am not responsible for this after all? Furthermore, these are mainly wear parts (EZ 2002, 217,000km) which in my opinion are no defects. He also accuses me that I did not let the vehicle look through in a workshop before I sold it. (Who does that?) Now, if I don’t transfer the money, he wants to sue me for an arrogant deception. Does he have a chance with it in court?!