How do I check how much factory warranty is left on a used car?

Ask the dealer for the vehicle's original in-service date, the date it was first sold, then compare it and the current mileage against the manufacturer's warranty terms on its website. A franchised dealer of that brand can often look up remaining coverage by VIN. Check whether the warranty transfers to new owners, since some powertrain warranties don't. Remaining warranty is one of the questions in OffLot's lot mode.