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How to Read a 17-Character VIN: Complete Structural Breakdown

Every modern automobile produced since 1981 carries a unique 17-character Vehicle Identification Number defined by ISO 3779. Here is what every single character represents.

By Chandresh Thakur·Updated September 2026·7 min read

The Three Primary VIN Sections

A standard 17-character VIN is subdivided into three distinct international sections:

1 — 3WMIWorld Manufacturer Identifier (Country, Maker, Division)
4 — 9VDSVehicle Descriptor Section (Model, Body, Engine, Check Digit)
10 — 17VISVehicle Identifier Section (Year, Plant, Production Serial)

Character-by-Character Walkthrough

Characters 1–3: World Manufacturer Identifier (WMI)

Assigned by SAE International, the WMI uniquely identifies the manufacturing entity:

  • Character 1 (Region / Country): 1, 4, or 5 = United States; 2 = Canada; 3 = Mexico; J = Japan; K = South Korea; S = United Kingdom; W = Germany; Z = Italy.
  • Character 2 (Manufacturer Division): B = BMW; A = Audi; T = Toyota; F = Ford; Y = Tesla (in 5YJ).
  • Character 3 (Vehicle Classification): Differentiates passenger cars, light trucks, multi-purpose vehicles (MPVs), or specialized performance divisions (e.g. WBS for BMW M GmbH).

Characters 4–8: Vehicle Descriptor Section (VDS)

Determined by the specific manufacturer's internal engineering codes:

  • Position 4: Vehicle model family or platform line (e.g., 3 Series vs 5 Series).
  • Position 5: Body style (2-door coupe, 4-door sedan, crossover, pickup cab).
  • Position 6: Restraint system configuration (airbag arrangement, active seatbelts).
  • Position 7–8: Powertrain, engine displacement, cylinder layout, or electric battery capacity.

Character 9: Security Check Digit

Computed using the mathematical Modulo 11 formula to detect transcription typos. Learn the full arithmetic in our Check Digit Calculation Guide.

Character 10: Model Year Code

Standardized 30-year repeating cycle of letters and numbers (e.g., L = 2020, M = 2021, N = 2022, P = 2023, R = 2024, S = 2025, T = 2026).

Character 11: Assembly Factory Plant Code

Manufacturer-specific letter identifying the exact factory where the vehicle was assembled (e.g., F = Fremont, California for Tesla; A = Munich, Germany for BMW; U = Georgetown, Kentucky for Toyota).

Characters 12–17: Sequential Production Serial (VIS)

The vehicle's unique sequential chassis production number as it rolled off the assembly line.

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