How to check a VIN before buying a used car

What is a VIN?

The VIN (Vehicle Identification Number) is the car's unique 17-character fingerprint. It encodes the manufacturer, model, engine, year and place of production, and links to the vehicle's official records.

Where to find the VIN

Look at the base of the windshield on the driver's side, on the driver's door pillar, in the engine bay, and on the registration documents.

The VIN must be identical in every location and on the paperwork. A mismatch, sticker tampering or a re-riveted plate is a serious warning sign.

What a VIN check reveals

Depending on the country and data source, a VIN check can surface: declared accidents and insurance write-offs, odometer/mileage records, number of previous owners, theft records, recalls, and the original specification of the car.

Comparing the declared specification with the actual car helps detect clones, swapped engines or undisclosed changes.

Free vs paid VIN checks

Some data is free: manufacturer recall lookups (e.g. NHTSA in the US) and basic decoders that expand what the VIN means.

Full history (accidents, write-offs, mileage timeline) usually comes from paid providers. CarGuard AI can pull a history report as part of an inspection where available.

Red flags in a VIN report

Mileage that goes down over time, gaps in history, a salvage/write-off title, multiple recent owners, or a specification that does not match the car in front of you.

Any of these deserves a direct question to the seller and, ideally, a professional inspection before you pay.