<prompt> Human: So Im making payments on a 2008 Nissan Sentra and it looks like it might be time to trade it off. The mechanic said it was a problem with the transmission Ill spare you the details that would run me 4000 dollars, which I dont have, and even if I did, probably wouldnt be worth the cost. This is a first for me, so Im not sure how or where to sell it. I also dont know how to deal with the remaining cost I owe for the vehicle itself. The car still drives, but the engine light is on, so I dont know how that would effect the price I could get by selling it. Tl; dr- Car has a fatal mechanical error, howwhere should I sell it?  <response>: Theres no way that should cost 4gs get a second opinion 