The 17 digits of the VIN — what each position means

Under the international standard ISO 3779, the vehicle identification number (VIN) consists of exactly 17 characters. It is made up of three clearly defined blocks: the World Manufacturer Identifier (WMI, positions 1-3), the Vehicle Descriptor Section (VDS, positions 4-9) and the Vehicle Identifier Section (VIS, positions 10-17). No character in a valid VIN may be I, O or Q — these letters are excluded because their visual similarity to the digits 1, 0 and 9 would lead to confusion in handwritten transcription or with poorly legible stamped characters. What the VIN does not contain: mileage data, changes of owner, accident history or any other operating information. It encodes solely the identity of the vehicle at the time of its production.

The World Manufacturer Identifier consists of the first three characters of the VIN and is the only fully standardised piece of information assigned uniquely worldwide. It is allocated and managed globally by the Society of Automotive Engineers (SAE) and the ISO. The first character determines the manufacturer's world region: A to H stands for Africa, J to R for Asia and Oceania, S to Z for Europe, 1 to 5 for North America, 6 and 7 for Australia and Oceania, 8 and 9 for South America. The second character pinpoints the country within the region — W, for example, stands for Germany, V for France or Spain, J for Japan, K for Korea. The third character identifies the specific manufacturer. So WBA stands for BMW AG Munich, WVW for Volkswagen Wolfsburg, ZFF for Ferrari, TRU for Audi in Hungary. Manufacturers with an annual production of fewer than 500 vehicles receive a '9' in the third position — the individual vehicle number then begins at a different position. The WMI is the most reliable piece of information a VIN decoder can deliver: if it does not match what is stated in the vehicle registration document, that is a serious warning sign.

The Vehicle Descriptor Section covers positions 4 to 9 and describes the vehicle model according to manufacturer-internal conventions. There is no international standard here dictating which position contains which information — each manufacturer defines the VDS encoding itself. With German premium manufacturers, these positions usually encode the model series, the body type (saloon, estate, SUV, coupé), the engine type (petrol, diesel, electric), the power level and the transmission. Volkswagen, for instance, encodes the emissions class at position 5, the body at position 6 and the engine type at position 7. BMW uses other positions for other characteristics. Without the manufacturer's brand-specific decoding key, the VDS positions cannot be read in a general way. Position 9 has a special function in North America: in the USA and Canada it is a mathematically calculated check digit, computed from the remaining 16 characters by a defined algorithm and confirming the integrity of the number. European vehicles use position 9 according to their own conventions — there is no check digit here.

Position 10 of the VIN is intended, under the ISO standard, to encode the vehicle's model year. The system uses letters and digits in a fixed sequence: A corresponds to 1980, B to 1981, and so on up to Y for 2000. From 2001 onwards digits follow (1 for 2001, 2 for 2002) and after that letters again (A for 2010, B for 2011, etc.). That sounds unambiguous — but for EU vehicles it is only of limited reliability. In North America, encoding position 10 according to this scheme is legally required (FMVSS 115). In the European Union there is no equivalent obligation. European manufacturers fill position 10 according to their own conventions, and many large brands deviate considerably from the ISO scheme or ignore it entirely. The model year that a decoder reads from position 10 can, for a European vehicle, differ from the actual year of first registration by one to three years — that is not an error of the decoder but a structural limit of the standard. The decisive figure for the year of manufacture is always the date of first registration in registration certificate Part I. Anyone buying a used car should therefore always cross-check the model year indicator from the VIN against the vehicle registration document.

The Vehicle Identifier Section forms the final block of the VIN and makes every vehicle uniquely identifiable. Position 11 encodes the production plant within the manufacturer's corporate group: a BMW from Leipzig carries a different plant code than an identical model from Munich or from Rosslyn in South Africa. Manufacturers with several plants use this position systematically to keep production traceable. Positions 12 to 17 form the vehicle's sequential serial number. They guarantee that within one model year and one plant no second vehicle receives the same VIN. Together, the WMI, model year indicator, plant code and serial number make every VIN unique worldwide — no second vehicle carries the same 17-character combination. This is precisely what makes the VIN the central identifying feature at workshop visits, registration procedures, insurance contracts and vehicle history lookups: it is the vehicle's fingerprint number.