What Carfax does with a VIN
Carfax is a private company that collects and sells vehicle history reports based on your VIN. When you enter a VIN on Carfax.com, the company searches its database for records tied to that vehicle — accident reports, service records, title transfers, odometer readings, and recalls. Carfax does not determine whether a car is safe or worth buying. It shows you what records exist in their system, which is incomplete by design: not every accident gets reported to Carfax, not every service visit is recorded, and not every state reports title information the same way.
Carfax pulls data from insurance companies, auto repair shops, DMV records, police reports, and auction houses. If an accident happened but was never reported to insurance or police, Carfax will not know about it. If an owner paid cash for repairs at an independent shop, that work may not show up. The report is useful as one piece of information, not as proof that nothing bad happened to the car.
You can run a Carfax report for free on some dealer websites, or you can pay Carfax directly for a single report or a subscription. The cost varies, but a one-time report typically runs between $20 and $30. Some dealerships include a free Carfax report with their listing.
Key Takeaways
- Carfax searches its database for accident reports, service records, title transfers, and recalls tied to a specific VIN, but the database is incomplete and does not include every repair or accident.
- A Carfax report costs money unless you find it free on a dealer listing, and you should always run one before buying a used car.
- Carfax reports do not replace a pre-purchase inspection by a mechanic, which is the only way to know the actual condition of the car.
- A clean Carfax report does not mean the car has no problems; it means Carfax has no records of reported incidents.
What information shows up in a Carfax report
A Carfax report displays the vehicle's title history, ownership changes, mileage records, accident and damage reports, service records, and any open recalls. The report also shows whether the title is clean, salvage, rebuilt, lemon law buyback, or flood-damaged. This information matters because a salvage title means the car was declared a total loss by an insurance company at some point, and a rebuilt title means it was repaired and re-registered after that.
The report lists accidents and damage claims reported to insurance companies, but only if the insurance company reported them to Carfax. Minor accidents that owners paid for out of pocket will not appear. Service records come from shops that report to Carfax — typically larger chains and dealerships — so independent mechanics' work is often missing.
Carfax also flags open recalls from the National Highway Traffic Safety Administration (NHTSA). If a recall exists for that VIN, the report will list it. However, Carfax does not tell you whether the recall has been completed; you have to contact the manufacturer or check NHTSA's website directly to confirm the repair was done.
How to read a Carfax report
When you open a Carfax report, start with the title status at the top. If it says "Clean Title," the car has not been declared a total loss. If it says "Salvage Title" or "Rebuilt Title," the car was totaled and repaired, which affects its value and insurance cost. A "Flood" designation means the car was damaged by water, which can cause hidden electrical and mechanical problems years later.
Next, look at the ownership history. How many owners has the car had? How long did each owner keep it? A car that changed hands five times in three years may indicate problems, though it could also just mean it was a fleet vehicle or rental.
Review the mileage timeline. Does the odometer reading go up consistently, or are there gaps or backwards jumps? Backwards mileage is a red flag for odometer fraud. Gaps in the timeline are normal if the car was not serviced during that period.
Check the accident and damage section. Carfax rates accidents as "minor," "moderate," or "severe" based on insurance claim data. A single minor accident years ago is different from three moderate accidents in the past year. Read the details: was it a collision, fire, flood, or hail damage?
What Carfax does not tell you
A clean Carfax report does not mean the car is in good condition. It means Carfax has no records of reported accidents or damage. The car could have been in an accident that the owner never reported to insurance, or it could have mechanical problems that have nothing to do with accidents.
Carfax does not inspect the car. It does not check whether the engine runs, whether the transmission shifts smoothly, whether the brakes work, or whether the interior is falling apart. It does not tell you the car's actual market value or whether the asking price is fair. It does not predict future repairs or reliability.
Carfax also does not include every service record. If an owner took the car to an independent mechanic, a tire shop, or a small local dealership, that work may not show up on the report. A car with a sparse service history might have been well-maintained at shops that do not report to Carfax, or it might have been neglected.
Carfax versus AutoCheck and other history reports
Carfax is the largest vehicle history company, but it is not the only one. AutoCheck is another major provider, and it sometimes has different data because it pulls from different sources. Some cars show more accidents on AutoCheck than on Carfax, or vice versa. Running both reports on a car you are considering can give you a more complete picture.
Other services like VINCheck (run by NHTSA) are free and show recalls and safety complaints, but they do not show accident or service history. The National Insurance Crime Bureau (NICB) runs a theft database that shows whether a car was reported stolen.
For the most thorough check, run Carfax, AutoCheck, and the free NHTSA VINCheck, then have a mechanic inspect the car in person. No report replaces a hands-on inspection.
When to run a Carfax report and what to do with it
Run a Carfax report before you test-drive a car, not after. If the report shows a salvage title, major accidents, or open recalls, you can decide whether to move forward before investing time. If you are seriously interested in a car, run the report again a day or two before you buy it, in case new information has been added.
Use the report to ask the seller questions. If the report shows an accident, ask the seller what happened and whether the repair was done properly. If there are open recalls, ask whether the dealer will complete them before you take ownership. If the service history is sparse, ask why and whether the owner has records from independent shops.
Bring the Carfax report to your mechanic's inspection. Show them the accident history and service records so they know what to look for. A mechanic can often tell whether a car was in an accident based on paint thickness, frame alignment, and suspension wear, even if the repair was done well.
Frequently Asked Questions
Can I run a Carfax report for free?
Some dealer websites show a free Carfax report with their listing, so you can check before contacting them. Otherwise, you pay Carfax directly — usually $20 to $30 for a single report. Some dealerships will run one for you if you ask, though they may charge a fee or require you to be a serious buyer.
What does a salvage title mean on a Carfax report?
A salvage title means an insurance company declared the car a total loss at some point — usually because repair costs exceeded a percentage of the car's value. The car was then repaired and re-registered. Salvage and rebuilt titles lower the car's resale value and may affect insurance rates. Some lenders will not finance a car with a salvage title.
If Carfax shows no accidents, is the car safe to buy?
No. A clean Carfax report means Carfax has no records of reported accidents, but the car could have been in an unreported accident, or it could have mechanical problems unrelated to accidents. Always have a mechanic inspect the car before you buy it, regardless of what Carfax shows.
Does Carfax show whether recalls have been fixed?
Carfax shows that a recall exists for that VIN, but it does not always show whether the repair was completed. Contact the manufacturer directly or check NHTSA's website to confirm the recall was done. You can also ask the dealer to show you proof of the repair before you buy.
What if the Carfax report has wrong information?
Carfax allows you to dispute information on your report through their website. You will need to provide documentation — a police report, repair invoice, or title paperwork — to support your dispute. Corrections can take several weeks to process.