Start by confirming it decodes
A VIN encodes the manufacturer, the model year, the plant and the engine family. Run it through a free decoder and compare what comes back against the listing. A VIN that decodes to a different engine or a different year than the catalogue claims is not a typo to shrug at — it is either a mistake in the listing or a mistake in the vehicle.
Then check the brands against it
Title brands follow the VIN, not the paperwork in the glovebox. Salvage, rebuilt, flood, lemon and odometer-discrepancy brands are recorded federally and are visible in commercial history reports. A clean history report is not proof of a clean history, but a branded one is proof of a brand.
Look for the gaps
History reports are built from events: registrations, inspections, service records, auction appearances. What you are looking for is a vehicle that disappears for two years and reappears in another state with fewer miles than before.
- Odometer readings that fall over time
- A long gap followed by a new state of registration
- Repeated auction appearances in a short window
- An open lien recorded against the vehicle
Match the plate to the metal
On older vehicles especially, check that the VIN on the dash plate matches the one on the door jamb sticker and the one in the paperwork. Ask the house for a photograph of each if the listing does not include them. A house that will not photograph a VIN is telling you something.
From the auction floor
See how this works on a real lot.
Every listing carries its inspection report, its full specification and its bid history. Read one before you decide what it is worth to you.