What Carfax does with a VIN number
Carfax is a company that collects and sells vehicle history reports. When you give Carfax a VIN (Vehicle Identification Number — the 17-character code unique to each car), it searches its database for records about that specific vehicle. Those records come from insurance companies, police reports, service shops, auctions, and state DMV offices.
A Carfax report shows you things like past accidents, title problems, service records, ownership changes, and whether the car was ever reported as stolen or flooded. It does not tell you whether the car is mechanically sound right now — that requires a mechanic's inspection — but it does flag problems that happened in the past and might affect the car's value or safety.
Carfax reports cost money. A single report typically costs between $20 and $30, though prices vary. Some dealerships and sellers provide free Carfax reports as part of their listing, so always check before you pay.
Key Takeaways
- A Carfax report requires the 17-character VIN, which you can find on the driver's side dashboard, the door jamb, or the title document.
- Carfax reports show accident history, title issues, service records, and ownership changes, but not current mechanical condition.
- Single reports cost $20 to $30, though many dealerships and private sellers post free Carfax reports online with their listings.
- Carfax data comes from insurance claims, police reports, and state records, so older accidents or repairs done outside the insurance system may not appear.
- A clean Carfax report does not mean the car is problem-free — always have a mechanic inspect any used car before you buy.
Where to find the VIN on the car or documents
The VIN is printed in several places on and in the vehicle. The easiest spot is the lower left corner of the windshield on the driver's side — you can read it from outside the car. It is also stamped on the driver's side door jamb (the vertical part of the door frame) and on the vehicle title, registration, and insurance documents.
If you are looking at a car in person and the windshield label is hard to read, check the door jamb or ask the seller for the title. If you are shopping online, the VIN should be listed in the ad or listing. Never buy a car without confirming the VIN matches across all documents — mismatches can signal title problems.
How to run a Carfax report online
Go to Carfax.com and look for the search box on the homepage. Enter the 17-character VIN and click search. Carfax will show you a preview of what the report contains — usually accident history, title status, and number of owners — before you pay.
If you decide to purchase the report, you will enter your payment information (credit card, debit card, or PayPal). The full report appears when ready after payment and can be viewed online or downloaded as a PDF. You can also print it to share with a mechanic or keep for your records.
Some used car websites like AutoTrader, Cars.com, and Edmunds let you run a Carfax report directly from their listings without going to Carfax.com. The cost is the same, but it saves a step if you are already browsing cars there.
What information appears in a Carfax report
A standard Carfax report includes the vehicle's title history (whether it has ever been branded as salvage, flood, lemon law, or rebuilt), the number of previous owners, service records from participating shops, accident and damage reports, and odometer readings over time. It also shows whether the car was ever reported as stolen or used as a rental or fleet vehicle.
The report displays each event with a date and source — for example, "Accident reported by insurance company on March 15, 2021" or "Oil change recorded by Toyota dealer on January 8, 2023." This helps you understand the car's timeline and spot patterns, like whether it has been regularly maintained or has had multiple accidents.
Carfax also assigns a color-coded status to the title: green means clean, yellow means there is a branded title or other issue, and red means a major problem like salvage or flood damage. This visual summary makes it straightforward to spot red flags at a glance.
What Carfax reports do not show
Carfax reports are based on records that are reported to them. If an accident was never reported to insurance, never went through police, and was repaired at an independent shop that does not share data with Carfax, it will not appear on the report. The same is true for routine maintenance done by the owner themselves or at a shop that does not participate in Carfax's network.
A Carfax report also does not tell you whether the car runs well, whether the transmission is failing, whether the engine has internal damage, or whether the brakes are worn. It is a history document, not a mechanical inspection. For that reason, a clean Carfax report should never be your only reason to buy a car — always have a trusted mechanic inspect it in person before you commit.
When to use Carfax versus other history reports
Carfax is the largest and most widely used vehicle history service, but it is not the only one. AutoCheck (owned by Experian) and NMVTIS (the National Motor Vehicle Title Information System) are alternatives that sometimes have different data, especially for cars with salvage or branded titles.
Many buyers run reports from both Carfax and AutoCheck to cross-check information, since each service has different data sources. NMVTIS is a government database that focuses specifically on title history and is often used by dealers and inspectors. If you are buying from a dealer, ask whether they have already run reports from multiple services — many do and will share them with you.
For most private sales, a single Carfax report is enough to start your research. If the report raises concerns — like multiple accidents or a branded title — that is when you might want to run a second report or dig deeper with a mechanic.
How to interpret a Carfax report and what to do next
Start by checking the title status. A clean title is green and means no major problems. A yellow title means the car has been branded (salvage, rebuilt, flood, lemon law, or similar) — this does not always mean you should walk away, but it does mean the car has a history you need to understand and the price should reflect that risk.
Next, look at the accident history. One minor accident years ago is usually not a deal-breaker, especially if the car was repaired and has had no problems since. Multiple accidents, recent accidents, or accidents involving structural damage (frame, suspension) are more serious and should lower your offer or make you reconsider the purchase.
Check the number of owners and how long each one kept the car. A car that has had five owners in three years might indicate problems that are not showing up in the report. Compare the odometer readings across the timeline — if they jump backward or forward unexpectedly, that is a red flag for odometer fraud.
Finally, take the report to a mechanic before you buy. Show them the accident history and service records so they know what to look for. A mechanic can often spot signs of past damage or poor repairs that Carfax cannot detect.
Frequently Asked Questions
Can I get a free Carfax report?
Many dealerships and online car sellers include a free Carfax report with their listings, so check there first before paying. Some credit card companies and auto insurance providers also offer free reports as a cardholder or customer benefit. If you cannot find a free report, a single report costs $20 to $30.
What does a branded title mean on a Carfax report?
A branded title means the car has been labeled by a state DMV as salvage, rebuilt, flooded, a lemon law buyback, or similar. It does not mean the car is unsafe, but it does mean it has had a significant problem in the past. Branded title cars are worth less and may be harder to insure or resell.
If Carfax shows no accidents, is the car definitely safe to buy?
No. Carfax only reports accidents that were reported to insurance, police, or participating shops. Accidents repaired privately or at independent shops may not show up. Always have a mechanic inspect any used car in person, regardless of what Carfax says.
Can I run a Carfax report without the VIN?
No, Carfax requires the VIN to search its database. If you do not have the VIN, you can ask the seller for it or find it on the car itself (driver's side windshield or door jamb). Some online listings include the VIN in the ad.
How old can information in a Carfax report be?
Carfax reports can include information going back to the car's first registration, sometimes 10 to 20 years or more. Older information is still useful for understanding the car's full history, but focus most on recent years when deciding whether to buy.