I thought it might be worthwhile to summarize what we know about the Model S Certified Pre-Owned program and speculate about what we don't.
1) It will be a centralized program, with all cars shipped to CA for refurb and then delivered across the country like new vehicles are. [My bet would be Lathrop over Fremont - better trucking logistics and cheaper labor]
2) No hardware upgrades like Autopilot will be done. [Service campaigns for troublesome items like early door handles, 12V batteries, etc. might make sense.]
3) There will be a website where buyers can search the aggregate inventory for the cars that most closely match their desired specs.
4) Cars will carry a Tesla warranty. [Most likely of some minimum length, not just what is left on the original warranty. Will they go all the way to 4 years/50K additional miles?]
5) The sales price will go to the revenue line and the cost of the trade-in + refurb will go to the COGS line. [Hard to maintain 25% margins unless you are buying really low and selling really high]
A big question is how much of a premium will buyers of used Teslas pay for the ordering convenience, large inventory, factory warranty, delivery specialist delivery, etc. of Tesla's CPO program. My guess is quite a bit, but I have no idea how much that would be.
Another question is how will the NADA react to this. Adding used car sales to new cars + all service sure looks like a monopoly.