Should You Run Both CARFAX and AutoCheck on the Same Car?

Every major car-buying guide ends the CARFAX-versus-AutoCheck debate the same way: if the car matters to you, run both. Edmunds says it, Autolist says it, half the comparison articles on page one say it. What none of them tell you is how to do that without spending seventy-plus dollars on a car you might not even buy. This guide covers what each report catches that the other misses, what running both actually costs, and when the bundle is worth it versus when a single report will do.

The short answer

If you are seriously considering a specific used car — you have seen it, you are negotiating, you might hand over money this week — run both reports. CARFAX and AutoCheck pull from overlapping but different data sources, and the record that kills a deal is often sitting in only one of the two databases. Bought at retail, that advice costs about $75. Bought as a CARFAX and AutoCheck bundle for $6.75, it costs less than a gas-station lunch, which changes the math completely.

Why one report can miss what the other catches

Both companies build their reports from the same general categories of sources: state DMVs and title records, insurance carriers, auction houses, service shops, and police accident data. But neither has every source, and the gaps are not the same gaps.

CARFAX has spent decades signing up service and repair shops, so it tends to carry richer maintenance histories — oil changes, dealer service visits, timing-belt replacements. AutoCheck, owned by the credit bureau Experian, has historically had stronger coverage of auction activity, which matters because cars that cycle through auctions are exactly the cars most likely to be hiding something.

The practical consequence: an accident reported to one data partner but not the other shows up on one report and simply does not exist on the second. Neither company claims complete coverage, and repairs paid in cash at an independent shop can be invisible to both. Running both reports does not guarantee you see everything — nothing does — but it closes the gap between the two databases, which is the cheapest risk reduction available before you pay for a mechanical inspection.

What running both costs: retail vs. bundle

Here is the price picture for getting both reports on a single VIN.

The bundle is the option the big comparison guides never mention, because most sellers only offer one report or the other. At $6.75 for both, the "should I really pay twice?" question that hangs over the retail decision mostly disappears. You can see current single-report and bundle pricing on the pricing page.

What CARFAX is better at

CARFAX generally has the edge on service history depth. If the car was maintained at dealerships or chain shops, the CARFAX often reads like a logbook: dates, mileage, and what was done. That is gold for judging how the car was treated, spotting odometer inconsistencies, and verifying a seller's "always dealer-serviced" claim. CARFAX also reports the number of previous owners with usage type (personal, fleet, rental, lease), which shapes what a fair price looks like.

What AutoCheck is better at

AutoCheck's standout features are auction coverage and the AutoCheck Score — a numeric score that compares the vehicle against similar cars of the same age and class. The score gives you a fast, one-glance read on whether this particular car is above or below par for its segment, and the auction records can reveal that a "one-owner cream puff" ran through a salvage auction two states away. If the car you are looking at came from a dealer who buys at auction — most do — the AutoCheck side of the bundle is where surprises tend to surface. Our cheap AutoCheck guide goes deeper on reading AutoCheck reports and scores.

When the bundle pays for itself

Some situations make the second report close to mandatory rather than nice-to-have.

• Private-party sales. No dealer disclosure obligations, no reconditioning paper trail. You are the entire due-diligence department.
• Out-of-state cars. Title washing — moving a branded title through states with looser rules until the brand disappears — is precisely the scenario where a record survives in one database but not the other. If a salvage or rebuilt brand is your worry, also check salvage title rates by state to see how common branded titles are where the car has lived.
• Auction-sourced and rental-fleet cars. AutoCheck's auction data plus CARFAX's usage-type flag together tell you what the seller may not.
• Anything over about $10,000. At that price, $6.75 is 0.07% of the purchase. The asymmetry does the arguing.

How to read the two reports together

Do not just skim each report separately — compare them line against line.

1. Check the accident sections against each other. An accident on one report and not the other is not a contradiction; it is the whole reason you bought both. Treat the union of the two lists as the car's real history.
2. Reconcile the odometer readings. Both reports log mileage at title transfers, inspections, and service events. A reading that goes backward on either report is a walk-away signal.
3. Compare owner counts and usage types. The two companies sometimes segment ownership differently. If one says two owners and the other says four, ask the seller why.
4. Use the AutoCheck Score as a tiebreaker. If the histories look clean but the score is well below the range for similar vehicles, something in the underlying data dragged it down — read the report again, slowly.

For a fuller breakdown of how the two report formats differ, see our CARFAX vs AutoCheck comparison.

When a single report is enough

Honesty cuts both ways: not every situation needs both reports. If you are casually screening a dozen listings to decide which three to go see, one report per car is a reasonable filter — at $4.50 a report you can afford to screen widely and save the bundle for finalists. If the car is very cheap and you are buying it as a known project, a single report plus your own eyes may be all the paper you need. The bundle is for the car you are about to actually buy.

Frequently asked questions

Is the bundle the same reports I would get from carfax.com and autocheck.com?

You receive the full CARFAX and full Experian AutoCheck vehicle history for the VIN you enter — the same underlying report data, delivered within minutes, without the retail price.

Why is the bundle cheaper than buying the two reports separately here?

Single reports are $4.50 for members and $5.50 for guests, so two separate reports run $9.00 to $11.00. The bundle prices both reports on one VIN together at $6.75 because they are pulled in a single lookup.

Do CARFAX and AutoCheck use the same data?

They overlap heavily — DMV title records, police reports, insurance data — but each has exclusive sources. CARFAX is stronger on service records; AutoCheck is stronger on auction history. That difference is the entire case for running both.

Can a car be clean on both reports and still have hidden damage?

Yes. Damage repaired privately, without an insurance claim or a shop that reports data, can be invisible to both companies. Reports are for catching what is on record; a pre-purchase inspection is for catching what is not.

Which report do dealers usually show, and why does that matter?

Dealers typically show whichever report they subscribe to — often just one. If a dealer shows you a clean CARFAX, the report you should buy is the AutoCheck, because it is the one you have not seen.

What is a good AutoCheck Score?

The score is relative: AutoCheck displays your vehicle's score alongside the typical range for similar cars of the same age and class. In or above the range for its segment is what you want to see; well below the range means the history needs a closer read.

Does running both reports on the same VIN cost extra the second time?

No — the $6.75 bundle covers both reports for one VIN in one purchase. If you move on to a different car, that is a new VIN and a new lookup.

Is it legal to buy reports from a discount service?

Buying a vehicle history report through a discount provider is legal for personal use in evaluating a vehicle. You are paying for a lookup on a specific VIN, the same as at retail.

Run both before you pay for the car

The comparison guides are right about one thing: on a car you are serious about, both reports beat either report. Where they leave you stranded is the checkout page, at roughly $75 retail for the pair. Get the CARFAX + AutoCheck bundle for $6.75, read the two reports against each other, and walk into the negotiation knowing everything that is on record about the car — for less than the cost of the fuel you will burn driving to see it.