What Carfax tells you and what it doesn't

A Carfax report is a vehicle history compiled from insurance claims, police reports, service records, and auction data. It shows accidents, title problems, mileage discrepancies, and service history that dealers and previous owners have reported to Carfax. What matters: Carfax does not know about every accident or repair. If a previous owner paid cash for repairs and never filed an insurance claim, Carfax won't see it. If damage was minor and the owner didn't report it, it won't appear. A clean Carfax report means no reported major incidents — not that nothing ever happened.

You get the report by entering the vehicle's VIN (17-character code on the dashboard or title). Carfax charges for reports, though many dealerships provide them free when you're shopping. Some used car listings on AutoTrader, Cars.com, and dealer websites include a free Carfax preview showing the headline items: title status, accident count, mileage history, and service records. The full report costs money and adds detail on each incident.

Key Takeaways

  • Carfax shows reported accidents, insurance claims, title problems, and mileage history, but misses unreported repairs and minor damage paid for in cash.
  • A clean report does not may provide the car has no damage — it means no major incidents were reported to Carfax's data sources.
  • You can get a free preview on most dealer websites and used car listing sites before paying for the full report.
  • Title problems (salvage, flood, lemon law buyback) are the most important red flags on a Carfax report and affect resale value permanently.
  • Carfax reports should be one part of your inspection — combine them with a pre-purchase inspection by a mechanic and a test drive.

What shows up on a Carfax report

Title status is the first thing to check. A clean title means the car was never declared a total loss by an insurance company. A salvage title means an insurer paid out a claim for major damage and the car was rebuilt. A flood title means water damage. A lemon law buyback means the manufacturer took it back under warranty. Any of these permanently affects the car's value and your ability to resell it — some states restrict how you can sell a salvage title car, and insurance companies charge more to cover it.

Accident history lists reported collisions, usually with the type of damage (front-end, side, rollover) and whether it was a minor or major claim. Carfax counts the number of accidents but doesn't always know the severity. A single fender-bender and a structural frame damage both count as one accident. Mileage history flags inconsistencies — if the odometer reading goes backward between service records, or if the current mileage is lower than a previous record, Carfax marks it as a discrepancy. This is a red flag for odometer fraud.

Service records show maintenance reported by dealerships and some independent shops. You'll see oil changes, brake service, transmission work, and major repairs. This is useful for understanding how well the car was maintained, but it's incomplete — many owners use independent mechanics who don't report to Carfax, and DIY maintenance won't show up.

Red flags that should stop you from buying

A salvage or flood title is the hardest red flag to move past. The car may run fine, but you'll have trouble selling it later, and insurance will cost more. Some lenders won't finance a salvage title car. If the seller hasn't disclosed the title status upfront, that's a sign of a problem deal.

Mileage discrepancies — where the odometer reading goes backward or jumps unexpectedly — suggest odometer fraud. This is illegal and means you can't trust the actual mileage on the car. High mileage wear may be hidden, and you're buying a car older than it appears.

Multiple accidents in a short time frame (three or more in two years) suggest either a careless owner or a car that's been in serious trouble repeatedly. A single major accident that was properly repaired is less concerning than a pattern.

How to read the accident section

Carfax lists accidents with a date, type of damage, and whether it was a minor or major claim. "Minor" usually means under $5,000 in damage; "major" means $5,000 or more. The problem: Carfax doesn't always know the repair quality. A major accident that was professionally repaired by a body shop with OEM parts may be safer than a minor accident that was poorly fixed with aftermarket parts.

This is why a pre-purchase inspection by a mechanic matters more than the Carfax report. A good mechanic can spot poor repairs, mismatched paint, frame damage, and structural issues that Carfax can't see. If the Carfax shows an accident, budget $150 to $300 for a pre-purchase inspection before you buy.

Comparing Carfax to AutoCheck and other reports

AutoCheck is Carfax's main competitor and pulls from different data sources (primarily auction data). AutoCheck sometimes catches title problems and auction history that Carfax misses, and vice versa. Some buyers run both reports for a complete picture. AutoCheck also charges per report, though some dealerships provide it free.

Neither Carfax nor AutoCheck is perfect. Both rely on reported data, so unreported repairs, cash-paid damage, and private-party accidents won't show up on either. A car with a clean report from both could still have hidden damage. The reports are tools to flag problems, not proof the car is safe or well-maintained.

When to order a full Carfax report versus the free preview

Start with the free preview on the dealer's website or listing site. If the headline items (title, accident count, mileage) look clean, you may not need the full report. If there are accidents listed, the full report gives you more detail on each one — the date, type of damage, and whether it was a minor or major claim. This detail helps you decide whether to dig deeper with a mechanic's inspection.

If the preview shows a title problem, mileage discrepancy, or multiple accidents, order the full report before you go see the car. If the preview is clean but you're seriously considering the car, a full report ($30 to $40) is cheap insurance before you commit to a mechanic's inspection and test drive.

Frequently Asked Questions

Can a car have an accident on Carfax and still be safe to buy?

Yes. A single accident that was professionally repaired may be fine. The key is getting a pre-purchase inspection by a mechanic who can check for frame damage, misaligned panels, and poor repairs. Carfax tells you an accident happened; a mechanic tells you whether it was fixed right.

What if the Carfax report is clean but the car feels wrong when I drive it?

Trust your instinct and the mechanic's inspection over the report. Carfax misses unreported accidents and repairs. If something feels off during the test drive, have a mechanic look at it before you buy. A clean Carfax doesn't mean the car is problem-free.

Does a salvage title car ever become a clean title again?

No. Once a car is branded with a salvage title, that mark stays on the title permanently, even if it's repaired and passes inspection. Some states allow a rebuilt title after inspection, but the salvage history remains on the record. Future buyers and insurers will always know about it.

How much should I negotiate off the price if there's an accident on the Carfax?

That depends on the repair quality and the car's market value. A minor accident on a five-year-old car might warrant $500 to $1,500 off; a major accident could be $2,000 to $5,000 or more. Get a mechanic's estimate for any remaining damage, then use that to negotiate. Don't guess — the inspection tells you what the accident actually cost.

Is Carfax information always current?

No. Carfax updates when it receives new data from insurance companies, police reports, and service records, which can take weeks or months. A recent accident may not show up when ready. If you're buying a car that was recently in an accident, ask the seller directly and request documentation from their insurance company.