Is CARFAX accurate?

What CARFAX says about its own data

CARFAX is open about the limits. Its support pages say its products are based only on information supplied to CARFAX, and that it doesn’t have the complete history of every vehicle. It recommends using a report together with a pre-purchase inspection and a thorough test drive.

In 2019, CARFAX’s director of public relations told NBC Connecticut that it doesn’t have all the data on every single car. So the useful question isn’t whether CARFAX is accurate in general. It’s whether the events that matter for this car were reported, and to whom.

Why accidents and repairs can be missing

CARFAX says that not every accident or damage event is reported, and not every one that is reported is passed on to CARFAX. The usual gaps:

• No claim, no record. A crash settled between drivers, and never reported to the police or an insurer, may leave nothing for any history report to find.
• Repairs at shops that don’t report. CARFAX says a service visit won’t show when the shop isn’t part of its service network, and work an owner does at home isn’t added to the history report. A body repair paid privately can go the same way.
• Title washing. CARFAX describes how a car branded in one state can lose the brand when it’s retitled in a state with different rules. Brands recorded against the VIN make that harder to hide.
• Timing. A report shows what CARFAX had on the day it was run. An event reported later appears only on a later report, so check the date on any copy you’re given.

Is CARFAX accurate for mileage?

A CARFAX report lists odometer readings recorded at events such as title transfers, inspections and service visits. CARFAX says it can’t promise those readings are correct. It analyzes the mileage history and the sources of each reading to flag a potential rollback or mileage inconsistency, and it advises checking the mileage with a dealer or a qualified mechanic.

If a state brands the title “Not Actual Mileage” or “Exceeds Mechanical Limits”, CARFAX says that brand will appear on the report. A reading lower than an earlier one is the clearest warning sign; long gaps between readings leave room for one. Our odometer rollback guide shows how to compare the readings with the car’s wear.

Value estimates are estimates

CARFAX’s History-Based Value starts from the car’s year, make, model, mileage, location and condition, then adjusts for history tied to the VIN, such as accidents, title brands, service records and the number of owners. It’s an estimate, not an appraisal: it can’t see the car in front of you, and any gap in the records is a gap in the value too.

How to cross-check a CARFAX report

1. Match the VIN. Check the VIN on the report against the dashboard, the driver’s door jamb and the title.
2. Read AutoCheck too. Experian’s AutoCheck draws on its own sources, including auction data, and adds the AutoCheck Score. A second set of records can catch what one misses. See CARFAX vs AutoCheck.
3. Check the title in NMVTIS. An NMVTIS report shows the current title, brands, odometer reading, total-loss and salvage history from the federal title database.
4. Look for auction records. If the car went through Copart or IAAI, an auction report shows lot photos and the damage recorded at the sale.
5. Get an inspection. The FTC says a history report isn’t a substitute for an independent inspection, and the Department of Justice strongly encourages one before you buy.

CARFAX and AutoCheck for the same VIN cost $12.99 here as a bundle.

The report consultant that comes with every report reads all the reports you own for a car side by side, and names the report behind each red flag, which helps you see where they disagree. Smart VIN Check is an independent reseller, not affiliated with CARFAX, Experian (AutoCheck), Copart or IAA.