What is the difference between manufacturer CPO and dealer certified?

Manufacturer CPO programs are backed by the automaker, follow a standard inspection checklist, and include a factory-backed warranty that any brand dealer can honor. "Dealer certified" programs are created by an individual dealer or group, and the coverage and inspection standards can vary widely. Before paying extra for any certification, ask for the written warranty terms, who backs them, the deductible, and where repairs can be done.