How To Decode A VIN Yourself: What Each Of The 17 Characters Means And How To Spot A Fake One

Résumé détaillé

A VIN looks like random noise, but every character in it answers a specific question: where the car was built, what it is and when it left the factory.

GUEST OPINION: A VIN looks like random noise, but every character in it answers a specific question: where the car was built, what it is and when it left the factory.

Since 1981, all road vehicles carry the same 17-character format. Learning to read it takes ten minutes and can expose a mislabeled car or a tampered plate. Here is how the code breaks down.

The code is split into blocks, and each block has a job. Running the number through a decoder like https://stat.vin, then comparing the output with the listing, takes about a minute. Reading it by hand is still worth learning, because it shows what the tool is checking:

Letters I, O and Q are never used, so they are not confused with 1 and 0. A VIN containing one of them is wrong from the first glance.

The 10th character is a quick way to catch a lying ad. The code runs through letters and digits in a 30-year cycle: A is 2010, B is 2011, and so on, with the digits 1 to 9 covering 2001 to 2009. Letters I, O, Q, U and Z are skipped. A seller claiming a 2019 model while the 10th character says 2016 has some explaining to do.

The ninth character is where things get mathematical. North American vehicles must have a check digit calculated from the other characters using a fixed formula of weights, with the result taken modulo 11 and a remainder of 10 written as X. Free online validators run this calculation instantly, and a free vin check will usually flag a failed digit along with the decoded specs. One caveat: European and Asian cars are not obliged to follow this rule, so a failed check digit on a car built outside North America is not proof of fraud by itself.

Decoding is only half the job. The number also has to be genuine and match the physical car. Start by finding it in at least three places: the dashboard plate visible through the windshield, the sticker on the driver's door jamb and the title or registration. All three must be identical, character for character. Differences are a serious warning.

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