If you bought a car privately, you have no recourse other than through your attorney or small-claims court. Returning a leased vehicle is virtually impossible due to the amount of depreciation, paperwork, and fees involved. If either feels you have a case, you'll need an attorney as well. If 30 days have passed since your vehicle's delivery and you haven't received your registration or title in the mail, call the dealer and ask for an explanation. If you remain unsatisfied after talking to the dealer, contact your state's DMV and Attorney General's Office to see if they can be of assistance.
Lemon laws apply only to new vehicles, ignoring used vehicles entirely.
If you have a leased lemon, you'll need to talk to your leasing company, as most state's lemon laws do not apply to leased vehicles. You may need to contact the state's Attorney General's Office in addition to your own attorney if the dealership and manufacturer remain uncooperative. The following sites have lots of useful information pertaining to lemon laws in different states. Inc. All rights reserved.