DealScan5 min read
How to check a used car history before buying
By the DealScan team · Updated 2026-06-08
What a Carfax report covers, what it misses, and how to verify title, accidents, and ownership yourself.
Quick answer
Run the VIN through a paid history report like Carfax or AutoCheck, the free NICB VINCheck for theft and salvage records, and NHTSA.gov for open recalls. A clean report does not guarantee a clean car — unreported accidents are common — so pair it with an inspection.
Key takeaways
- Carfax only shows reported accidents, not unreported ones
- Check the physical VIN against the dashboard, door, and title
- Look for title brands: salvage, flood, rebuilt, lemon law, theft recovery
What a history report actually covers
Carfax and AutoCheck pull from insurance claims, state DMV records, service shops, and auctions. They are useful for spotting title issues, odometer rollback, and reported accidents.
But they do not cover everything. Many accidents are never reported to insurance. Small repairs, minor body work, and some flood damage may never appear on a report. A history report is one tool, not the full picture.
What to check yourself that the report misses
Physically check the VIN on the dashboard, driver door jamb, and title. All three should match. Check for rust, unusual paint, overspray, and panel gaps that suggest unreported body work.
Look at the tires: if the car has mismatched tire brands or different wear levels, it may have unreported accident damage. Check the oil cap for milky residue (coolant in oil) and the exhaust for white smoke.
Use the report as a negotiation tool
If the report shows an accident or title issue, get a repair estimate and use it to negotiate. If the report is clean but the car has obvious issues, do not assume the clean report overrides what you can see.
A clean report plus a pre-purchase inspection plus a DealScan analysis gives you as much information as you can reasonably get before buying. Use all three together.