How to Decode a VIN (and Why You Should)

Every passenger vehicle built for sale in the US since model year 1981 carries a unique 17-character Vehicle Identification Number, assigned under 49 CFR Part 565. The characters are not random: each position encodes something about how and where the vehicle was built. Decoding it is the first step to checking a vehicle against the government record.

One quirk worth knowing before you start: the letters I, O and Q never appear anywhere in a VIN, because they are too easily confused with 1 and 0. If you think you see one, look again.

Where to Find Your VIN

What Each Position Means

Two positions deserve a closer look. Position 9 is a check digit computed arithmetically from the other sixteen characters, so a VIN with a transposed or invented character will usually fail the calculation — it is the cheapest way to catch a typo, or a fabricated number on a listing. Position 10 cycles every 30 years and skips the letters I, O, Q, U and Z along with the digit 0, which is why a 1995 and a 2025 vehicle can share the same year character. Use the rest of the VIN, or the vehicle itself, to tell which cycle you are in.

Why Decode a VIN?

What a VIN Decode Will Not Tell You

This is where a lot of buying advice overreaches. Decoding a VIN returns the vehicle’s build specification— what the factory made. It does not return its history. A decode cannot tell you whether a car has been stolen, written off, flood-damaged, odometer-rolled, or given a branded title, and no VIN decoder on any site can, because none of that information is encoded in the number.

For those questions you need a records check, not a decode:

• Title brands, odometer readings and total-loss records — NMVTIS, the federal title database run by the US Department of Justice, through one of its approved providers.
• Theft records— the National Insurance Crime Bureau’s free VINCheck lookup, or your state’s DMV.
• Open safety recalls — NHTSA’s VIN recall lookup, which is authoritative and free.

We do not sell vehicle history reports and we do not hold title, ownership or accident records. What we publish is the government safety record — recalls, complaints, investigations, crash-test ratings and fuel economy — organized by year, make and model.

Sources

• 49 CFR Part 565 — VIN content, format and check-digit requirements
• NHTSA vPIC VIN decoder — the official decoder, and the source of the manufacturer and attribute data behind ours
• NMVTIS — federal title, brand and odometer records (not part of a VIN decode)