Used car warranty laws vary from state to state, and these laws are in place to protect buyers from purchasing vehicles that need major repairs. The buyer is protected under the used car warranty law even if the dealer was not aware that the car needed repair. Depending on the state you live in, there are a certain number of days that you can return the vehicle to the dealership for repairs at no charge. The used car warranty law only covers you for a certain amount of days after you purchase your vehicle, so do not confuse this with the extended warranty law that covers you long after the other law expires. Warranties often cover the cost of repairs which are considered normal expenses, such as the replacement of worn parts. The law helps you to feel comfortable about buying a used car, but an extended warranty makes the expenses related to owning a vehicle much easier to bear.