Free VIN decoder: format check and VIN sections

Use this free VIN decoder to check the format of a 17-character Vehicle Identification Number and read its sections. It uses a limited local code table rather than a live manufacturer database. Treat the country, manufacturer and model-year results as suggestions to confirm against the vehicle and its documents.

How to check your VIN

1. Find the VIN on the vehicle and compare it with the V5C or foreign registration document. Our VIN guide explains common locations.
2. Enter the 17 characters. The format check looks at length and excludes the letters I, O and Q; it does not verify a check digit or establish that a VIN is authentic.
3. Read the section breakdown and any manufacturer or year suggestions. Confirm uncertain results with the manufacturer, especially for an import or an older vehicle.

What the VIN sections mean

The decoder divides the number into the World Manufacturer Identifier (positions 1–3), Vehicle Descriptor Section (4–9) and Vehicle Identifier Section (10–17). The details encoded within these sections vary by manufacturer and market.

The tool displays the character at position 9 but does not calculate or verify its check digit. A “format check passed” result therefore means only that the entered value meets this tool’s basic format rules.

Model year is not first-registration date

Where a manufacturer uses position 10 as a model-year code, the code can repeat across different decades. This decoder’s table chooses one year, so the displayed suggestion may be wrong for a vehicle from an earlier cycle. Some markets and vehicles use different conventions.

For example, the sample VIN 1HGBH41JXMN109186 contains the letter M at position 10. Our table suggests 2021, but M can also represent 1991 under a repeating model-year system. The VIN alone does not resolve that ambiguity.

Do not copy a suggested model year into a DVLA application as a manufacture or first-registration date. Use the original documents and manufacturer evidence required for your vehicle.

What this decoder does not check

This tool does not retrieve MOT history, tax status, finance, stolen-vehicle records, insurance write-offs, engine specifications or recall campaigns. It also cannot prove ownership or identify a cloned vehicle.

For a vehicle with a UK registration, use the free car check to review available government identity, tax, MOT, mileage and recall records. Compare the physical VIN with the paperwork separately.

Common questions

Why is the manufacturer unknown or incorrect?

The local table covers selected prefixes and includes broad matches. It is not a comprehensive manufacturer database. Confirm the full VIN with the manufacturer; do not assume that an unknown match means the vehicle is invalid.

Can I decode an older chassis number?

This tool expects 17 characters. Older vehicles may have shorter chassis numbers that require manufacturer or marque-specific records. Do not pad an older number with extra characters to make it pass.

Does a passing format check prove the car is genuine?

No. It does not verify the VIN against factory records, inspect the vehicle or check its provenance. Resolve mismatches between the vehicle, documents and seller’s description before proceeding.

What should I do with a VIN discrepancy on an import?

Compare every character on the vehicle and original registration documents. Obtain clarification from the issuing authority or manufacturer as appropriate. Use the V55/5 rejection risk checker to review common application inconsistencies; do not alter official documents to make them match.

Official sources and next steps

• GOV.UK: vehicle identification numbers explains the VIN’s role in registration.
• NHTSA’s manufacturer-reported VIN decoder offers a separate decoding service; coverage depends on manufacturer and market data.
• Use the V55 form checker to choose the applicable registration route, then the document checklist to prepare supporting evidence.

Guidance links checked 3 October 2026. This is an independent tool, not a DVLA or manufacturer service.