What Makes a Pre-Owned Vehicle, Certified?
Every certified car has to go through an inspection before it can be certified. The only certification that means anything is a manufacturer certified pre-owned car. All others are insurance backed programs. A certified car will only be offered by your local dealer and the warranty will extend beyond the initial “new car” warranty coverage. The warranty must be backed by the original manufacturer to be certified pre-owned.
If problems are found, the factory-trained technicians will fix it or disqualify the car from the program. The certified warranty protection typically takes effect when the original warranty expires and, like a new car warranty, offers coverage for a certain number of years or miles, whichever comes first. ~Edmunds.com