What Is Carfax? A Complete Guide to Vehicle History Reports by VIN
What is Carfax? How a Carfax report works — accidents, damage, mileage, owners and history-based value — and how to check any VIN before buying a used car.
Buying a used car shouldn't feel like a gamble. Yet many buyers only discover a hidden accident, a rolled-back odometer or an open recall weeks after the sale. A Carfax report is built to prevent exactly that.
What is a Carfax report?
A Carfax report is a vehicle history report tied to a car's unique 17-character VIN. Instead of trusting the seller, you get a documented timeline of the vehicle's past — accidents, mileage, ownership and more — so you can confidently buy a Carfax report for used cars.
How does Carfax get its information?
A vehicle history report is assembled from thousands of official sources:
- DMVs and registration records
- Police and insurance accident records
- Service and repair shops
- Auction houses and dealerships
What's inside a Carfax report?
Depending on the available data, a Carfax report can reveal:
- Accident & damage history
- Odometer / mileage readings
- Previous owners & usage
- Open recalls & emission tests
- Salvage, lien & theft checks
- History-based value estimate
Some buyers also compare it with a Carfax AutoCheck report to cross-check the story.
Is a Carfax report foolproof?
No report is perfect. A clean report means no major issues were reported — not that none exist. A minor accident in a small town, or one filed just days ago, may not appear yet. Treat the report as a powerful first filter, then use common sense.
Smart habits before you buy
- Test drive and watch for warning lights or odd noises.
- Get an independent mechanic's inspection.
- Buy from a transparent seller who shares the VIN.
Check any VIN with CFax
With CFax you can enter any VIN for free and instantly see whether a report is available and how many records it holds — no registration needed. When you're ready, buy a Carfax report for vehicles from the USA and Canada; purchased reports never expire and can be downloaded as PDF. Wondering how much a Carfax report costs? Our pricing is transparent and packages lower the cost per report. Run the VIN first — one report can save you months of regret.