I've heard various stories when it comes to dealers coughing up on vehicles that have gone bad after being sold, from 'that's no problem, we'll fix it entirely at our cost' to 'take me to court if you like, I just go bust or change my company name when I get enough complaints' and people that have taken dealers through the small claims court and eventually come to an agreement in court , after a year down the line of legal letters while the car sits and rots on your drive teasing you to fix it yourself and get on with your life.
You never know, you may get lucky ..