Crash test ratings belong to a model, not to one car, so you look them up by model year, make, model and body style on NHTSA's 5-Star Safety Ratings and on IIHS, and you use the VIN to prove which year and version you're actually standing next to. No database will tell you that this particular 2017 SUV still protects you the way the test car did. That part depends on what happened to it after it left the factory, which is where crash history, airbag replacement and frame repair come in.
What NHTSA's star ratings measure
NHTSA's 5-Star Safety Ratings come from its New Car Assessment Program and grade frontal crash, side barrier, side pole and rollover resistance on new vehicles. The frontal test sends the vehicle into a fixed barrier at 35 mph, which NHTSA says represents two similar vehicles of the same weight hitting head-on. The side barrier test hits a standing vehicle with a 3,015 lb barrier at 38.5 mph, and rollover is rated from a Static Stability Factor measurement plus a driving maneuver. One star is the lowest, five is the highest.
The comparison rules trip people up. NHTSA says frontal ratings, and the Overall Vehicle Score built partly on them, can only be compared within the same vehicle class and within plus or minus 250 pounds. Side and rollover ratings can be compared across classes. So a five-star frontal score on a small sedan and a five-star frontal score on a big pickup aren't saying the same thing. NHTSA also flags some vehicles with a warning symbol for a safety concern, like a door opening or a fuel leak in testing, and notes that this concern is not part of the star math. A high star count with a warning symbol next to it deserves a closer read.
You'll also run into "Not Rated" on plenty of used models. NHTSA says that just means the vehicle wasn't tested in that crash mode, and that every vehicle sold in the US is still certified by its maker as meeting the federal motor vehicle safety standards in 49 CFR Part 571. Not Rated is missing data, so don't read it as a failing grade. It does mean you lean harder on IIHS results, if any exist for that model, and on the car's own history.
What IIHS adds, and why old ratings don't line up with new ones
IIHS runs its own program and currently maintains ratings in eight tests, including small overlap front, moderate overlap front, side, headlights and front crash prevention. Its test lineup has changed over the years, and IIHS says ratings from discontinued tests are still shown for older models. That matters on a used car. A 2014 model's "Good" may be from a test that IIHS has since replaced with a harder version, so you can't stack it next to a 2024's "Good" and call them equal.
NHTSA's numbers shifted too. Consumer Reports explains that starting with the 2011 model year NHTSA made its crash tests more stringent, so 2011-and-newer results aren't comparable with older years. CR also notes that IIHS added the small-overlap front test in 2012. Honestly, if you're comparing a 2010 and a 2012 of the same nameplate, read each rating against its own era and don't trust a listing that just says "5-star safety."
IIHS also explains that it doesn't crash every model every year. If the maker reports no changes that could affect crash performance, the previous rating carries over, and ratings can be extended to models that share a platform. Fully electric variants must be tested separately. That's why the exact version matters.
Where the VIN fits in
The VIN is how you confirm you're reading the right rating. The 10th character usually encodes model year (our VIN 10th digit guide walks through it), and characters 4 through 8 usually describe body, engine and restraint details, though layouts vary by maker. NHTSA sorts vehicles by class and curb weight, and things like cab size, body style or drivetrain change weight, so the version you pick on the ratings site has to be the version in the driveway. Check that the VIN on the dash, the door label and the title all match before you trust any of it; how to find and verify a VIN covers the spots to check.
So the practical order is VIN first, decode the year and body, then look up that exact version on NHTSA and IIHS. If a seller's listing quotes a rating, look at which year and body style it came from before you repeat it to yourself as fact. Listing text is written to sell, and nobody checks it.
A rating describes the design, not this car's past
A crash-tested design only protects you as built, and a used car may not be as built anymore. A bad structural repair or a replaced airbag module from a sketchy source can undercut the score, and neither one shows on a ratings page. The federal certification NHTSA describes is about the car when it was built, too.
This is where history comes in. Read our posts on frame damage on CARFAX and airbag deployed on CARFAX to see how those events show up and what they leave out. Check for open safety recalls too; open recalls on CARFAX explains why a report line and the maker's own lookup don't always agree. If you're new to reading these, how to read a CARFAX report is the place to start. Then get the car on a lift with a mechanic who'll look at weld seams and airbag warning behavior.
Getting the history yourself
Look, a five-star car with an unreported frontal hit is not a five-star car anymore, and a thin report or a seller's recycled PDF won't tell you that. We're a licensed reseller of official CARFAX and AutoCheck reports and have no affiliation with CARFAX, AutoCheck or Experian; nobody can sell you a full official report for free. This November 2026, our guest price has been around $5.50 a report, with members near $4.50 and a combined CARFAX plus AutoCheck pull near $6.75, versus the roughly $39.99 to $44.99 people often pay direct. Confirm at checkout before you buy, since the cart is the final word.
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