Every vehicle built for the Japanese domestic market carries a chassis number
(車台番号, shadai bangō) — sometimes called a frame number — instead of the
17-digit VIN that overseas buyers expect. It looks like ZVW52-1234567:
a short model code, a hyphen, and a serial. That one string of characters unlocks the
car's recall history, its factory grade record, and an estimated production window.
This guide explains how the number is structured, where to find it, and what each
part actually tells you.
The two-part structure
A Japanese chassis number is two elements joined by a hyphen:
-
Model code — typically 5–7 letters and digits
(e.g.
ZVW52,LA150S). It identifies the model family and specification, and it is shared by every vehicle built to that specification. -
Serial number — typically 5–7 digits (e.g.
1234567). It identifies the individual body within that model code.
The system is far more granular than most buyers assume. As of mid-2026, the MLIT recall filings archived on this site reference 21,750 distinct model codes and 13,420 distinct chassis prefixes across 4,890 notifications. A single nameplate can span many different codes depending on engine, drivetrain, body style and generation — which is exactly why the code, not the badge, is what recall data is written against.
Part 1: the model code (型式)
The model code is the front half of the chassis number and the key that recall filings are written against. When a manufacturer notifies Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) of a defect, the filing lists the affected model codes and, for each one, a range of serial numbers. Two cars that look identical from the outside can carry different model codes — and completely different recall exposure.
One paperwork trap to know about: on some Japanese documents the model code is printed with an additional classification prefix in front of it, separated by a hyphen. If the code on the paperwork looks longer than what is stamped on the body, trust the stamped number — the chassis number itself is always model code plus serial. And if you are wondering why the code is not a VIN at all, that question has its own answer: see Why JDM cars don't have a 17-digit VIN.
Part 2: the serial number
The serial is a sequential body number within the model code. Recall filings record serial ranges, so whether a specific car is affected depends on where its serial falls — two cars with the same model code, built weeks apart, can land on opposite sides of a recall boundary.
The serial is also what makes a production estimate possible. Unlike a US VIN, which encodes the model year within its fixed structure, a Japanese chassis number does not encode the build year anywhere. But by intersecting the production periods of every recall filing whose serial range includes your car, the build window can usually be narrowed to within a few months. Any such figure on this site is clearly labeled as an estimate, with the underlying recall windows linked so you can verify it yourself.
Where to find the chassis number
- Stamped into the body. The number is physically stamped into the vehicle, commonly in the engine bay or on the bulkhead. The exact location varies by manufacturer and model, so check the vehicle's documentation for the stamping position on your specific car.
- On the vehicle inspection certificate (車検証). Japanese registration paperwork lists the chassis number in the 車台番号 field.
- On export paperwork. When a vehicle is deregistered and exported from Japan, the export documents identify it by chassis number — this is the number your import paperwork will be built around.
- On the auction sheet. Japanese auction sheets print the chassis number (or at minimum the model code) near the vehicle details.
Best practice before any purchase: ask for a photograph of the stamped number, not just the documents, and confirm the two match. A mismatch between metal and paperwork is something to resolve with the seller before money moves.
Common mistakes when reading one
- Reading the engine code instead. Engines carry their own model code stamped on the block. If what you found identifies the engine, not the body, recall lookups will not match.
- Full-width characters and unusual dashes. Japanese documents often use full-width digits or long-dash characters. Our decoder normalizes these automatically, but when copying the number elsewhere, use plain letters, digits and a standard hyphen.
- Including the paperwork classification prefix. Search with the model code and serial only.
- Treating it as a VIN. A 17-digit VIN decoder will reject a Japanese chassis number — or worse, misread it.
- Confusing model code with grade. The factory grade (trim level) is a separate manufacturer record. Our report shows the grade when the manufacturer's database returns one, and an honest "Not available" when it does not.
Run your chassis number
Once you have the number in hand, the free chassis decoder on our top page turns it into a full report: recall matches against the official MLIT serial ranges, the factory grade where available, and an estimated production window. If you would rather browse the raw registry, the Recall Archive holds all 4,890 filings from April 1993 to March 2026, organized by manufacturer and by year. And if you are checking a car ahead of an import purchase, follow the full sequence in our step-by-step import recall check guide.