Share this conversation. Expert: TJ, Esq. replied 4 years ago. Hello and thank you for allowing me the opportunity to assist you. No, I'm sorry to say that you cannot return a used car (or even a new car).Once you paid the dealer and took possession of the car, the sale was final. I truly wish I had better news.hare this conversation. Expert: TJ, Esq. replied 4 years ago. Hello and thank you for allowing me the opportunity to assist you. No, I'm sorry to say that you cannot return a used car (or even a new car).