What Carfax does with a VIN number
Carfax is a private company that collects and sells vehicle history reports. When you enter a VIN into Carfax's search tool, it pulls together records from insurance companies, repair shops, auction houses, DMVs, and police reports to build a timeline of what happened to that car. The report shows accidents, title problems, service records, odometer readings, and ownership changes — anything that was reported to those sources and fed into Carfax's database.
The VIN itself is the key that unlocks this information. A VIN is a 17-character code unique to every vehicle, and Carfax uses it to match records across different databases. If you're buying a used car, checking the title history, or investigating a vehicle you already own, a Carfax report can reveal problems that the seller might not mention or that you might not spot during an inspection.
Carfax does not have access to every record that exists — some repair shops don't report to them, some accidents go unreported to insurance, and some states don't share DMV data freely. A clean Carfax report does not may provide a car has no history; it means no history was reported to Carfax. That distinction matters when you're deciding whether to buy.
Key Takeaways
- Carfax searches its database using the 17-character VIN and returns records of accidents, repairs, title issues, and ownership history that were reported to insurance companies, repair shops, and DMVs.
- A Carfax report costs money per search, though some dealerships and websites offer free reports as part of their listings.
- Carfax does not have access to all repair records or accident reports — a clean report means nothing was reported to Carfax, not that nothing happened.
- The VIN must be entered exactly as it appears on the title or registration, with no spaces or typos, or the search will fail or return the wrong vehicle.
- Carfax reports are most useful when combined with a pre-purchase inspection by a mechanic and a title search through your state's DMV.
How to search Carfax by VIN
Go to carfax.com and look for the search box on the homepage. Enter the 17-character VIN exactly as it appears on the vehicle's title or registration — no spaces, no dashes, no guessing at characters you can't read. The VIN is usually stamped on the driver's side of the dashboard (visible through the windshield), on the driver's door jamb, or on the title document itself.
After you enter the VIN and click search, Carfax will either return a report or tell you the VIN was not found in their system. If the VIN is not found, it does not mean the car has no history — it means Carfax has no records for that vehicle. This happens with older cars, vehicles that were never in an accident or major repair, or cars that spent their entire life in states that don't share data with Carfax.
Once the report loads, you'll see sections for accident history, service records, title information, and ownership. Read through each section carefully. Pay special attention to the title section — salvage titles, flood titles, and lemon law buybacks are red flags that affect the car's value and insurability.
What information appears in a Carfax report
The accident and damage section shows reported collisions, the severity (minor, moderate, severe), and whether airbags deployed. It also lists structural damage, frame damage, and flood damage if those were reported. This section is one of the most important because it tells you whether the car was in a significant crash and how it was repaired.
The service history section pulls records from repair shops that report to Carfax — usually larger chains and dealerships. You'll see oil changes, brake service, transmission work, and other maintenance. Gaps in service history don't mean the car wasn't maintained; they usually mean the owner used an independent shop that doesn't report to Carfax.
The title section shows whether the car has a clean title, a salvage title, a flood title, a lemon law buyback, or other branded titles. A branded title means the car was declared a total loss by an insurance company, flooded, or had a major defect. These cars are legal to own and drive, but they're worth significantly less and can be harder to insure or resell.
The ownership and registration section lists how many owners the car has had and when ownership changed. Multiple owners in a short time can suggest the car had problems that made people want to get rid of it, though it can also just mean the car was traded in or sold between dealers.
The cost of a Carfax report and where to find free ones
Carfax charges per report. A single report costs money, and the price varies depending on whether you buy one report or a package. Carfax also offers a subscription model if you plan to check multiple vehicles.
Many dealerships and used car websites include a free Carfax report with their listings. If you're looking at a car on a dealer's website or on a marketplace like AutoTrader or Cars.com, check whether the listing already includes a report — you may not need to pay for one yourself. Some dealerships print the report and leave it in the car or give it to you when you arrive.
Your state's DMV may also offer a vehicle history search, though it typically shows only title and registration information, not accident or repair history. A DMV search is often free or low-cost and is worth doing in addition to Carfax because it pulls from official government records rather than third-party reports.
Why Carfax reports have gaps and what they don't show
Carfax depends on reports from other sources. If a repair shop doesn't report to Carfax, that repair won't show up in the history. Many independent mechanics, small shops, and owner-performed maintenance never reach Carfax's database. A car with a spotless Carfax report could have had significant work done at a shop that straightforward doesn't report.
Carfax also doesn't see accidents that were paid for in cash and never reported to insurance. If someone hit a parked car, paid the owner directly, and never filed a claim, Carfax will have no record of it. The same is true for minor damage that was repaired without insurance involvement.
Police reports and accident data vary by state. Some states share this information with Carfax; others don't. A car involved in an accident in a state with limited data sharing might show up as clean even though the accident happened and was reported to police.
How to verify a VIN before you search
Before you pay for a Carfax report, make sure you have the correct VIN. Ask the seller for the VIN from the title or registration — not from memory or from what's written on a window sticker. Window stickers and online listings sometimes have typos.
Check the VIN against the vehicle itself. The most reliable location is the driver's side door jamb, where the VIN is stamped into the metal. You can also find it on the title, the registration, and the dashboard. All of these should match. If they don't, something is wrong — either the car has been rebuilt with parts from another vehicle, or there's a title issue.
The first three characters of the VIN tell you the manufacturer and country of origin. The fourth through eighth characters identify the model and body style. Characters nine through seventeen are the serial number unique to that specific vehicle. You don't need to decode the whole VIN yourself, but knowing this helps you spot obvious errors — if the VIN says the car is a Honda but you're looking at a Toyota, the VIN is wrong.
Carfax versus other vehicle history sources
AutoCheck is Carfax's main competitor and uses similar data sources. Some people run both reports because they occasionally have different information — one might have a record the other missed. AutoCheck is owned by Experian and tends to have strong data from auction houses, which can be useful if the car was sold at auction.
Your state's DMV database shows title history, registration records, and sometimes accident reports, depending on the state. A DMV search is official and based on government records, but it usually doesn't include repair history or insurance claims. Many states allow you to search for free online or for a small fee.
A pre-purchase inspection by a mechanic is the most reliable way to find out what actually happened to a car. A mechanic can see evidence of past repairs, poor workmanship, rust, and wear patterns that no report can capture. For any car you're seriously considering buying, a mechanic's inspection is worth the cost and should happen before you commit to the purchase.
Frequently Asked Questions
Can I search Carfax without paying?
Some dealerships and online marketplaces include free Carfax reports with their listings, so check there first. If you're buying from a private seller, you'll likely need to pay for the report yourself. Your state's DMV may also offer a free or low-cost vehicle history search that shows title information.
What does it mean if Carfax says "no records found"?
It means Carfax has no data on that vehicle — not that the car has no history. This is common with older vehicles, cars that were never in an accident, or vehicles that spent their entire life in states with limited data sharing. A mechanic's inspection and a DMV title search are more useful in this situation.
Is a Carfax report enough to decide whether to buy a used car?
No. Carfax is one tool, but it has gaps. A clean report doesn't may provide the car is in good condition, and a report with issues doesn't mean the car is unsafe if repairs were done properly. Always combine a Carfax report with a pre-purchase inspection by a mechanic and a title search through your DMV.
Can I use someone else's Carfax report for the same car?
Yes. If a dealer or previous buyer has already run a report on the car, you can ask them for a copy. The information in the report is about the vehicle, not the person who ordered it, so you can use someone else's report to see the history. However, reports can be updated as new information comes in, so a report from weeks ago might be incomplete.
What should I do if I find a problem in the Carfax report?
Ask the seller about it directly. If the report shows an accident, ask for documentation of the repairs. If it shows a salvage title, ask why and whether the car was properly rebuilt. If the seller won't explain or the story doesn't add up, walk away — there are other cars. A mechanic can also review the report with you and tell you whether the repairs were done correctly.