When you buy a pre-owned model, you are taking a minor risk. Pre-owned vehicles do not come with any type of warranty, and do offer the possibility that they may not work for you as long as you need them to. With a certified pre-owned model, you are getting a vehicle that has been through a series of intense testing to better ensure that it is ready to take on the road ahead. The difference between the two essentially boils down to peace of mind.