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Japan Chassis Number Check: What a Japanese Frame Number Shows

Updated: 2026-10-06

Many people search for a “Japan chassis number check” or a “Japan VIN check” when they buy or repair a used car from Japan. The first thing to know is that most cars built for the Japanese market do not carry a 17-digit VIN. They carry a Japanese chassis number (車台番号) in a “model-serial” form. This guide explains the format, what a chassis number can and cannot tell you, and which other numbers you need to find the right parts and specifications.

Japanese chassis number format: model plus serial

In Japanese law, the chassis number (車台番号) includes an indication of the chassis model. The Road Transport Vehicle Act (道路運送車両法) says this directly when it lists the items on a registration application. So a Japanese chassis number has two parts: a model part and a serial number part.

MLIT (the Ministry of Land, Infrastructure, Transport and Tourism) sets the stamping rules in a notice on vehicle type approval. The main points are:

  • The number is arranged in the order: model, then serial number. An importer may add a symbol.
  • The parts are clearly separated with a hyphen or a similar mark.
  • The total length is 17 characters or less.
  • As an exception, a maker may stamp a VIN that follows the Japanese Industrial Standard JIS D4901. In that case the model-serial form is not required.

MLIT’s sample records show what this looks like. In one sample, the chassis number is R35-DSG-00001 and the model (型式) is CBA-R35. The chassis number starts with “R35”, the model part, and the rest follows after the hyphen. MLIT’s definition of the data in the electronic inspection certificate’s 2D code gives another example: HGC14-12345.

Example (MLIT)Model partPart after the modelRelated model code
R35-DSG-00001R35DSG-00001CBA-R35
HGC14-12345HGC1412345(not given in the sample)

The letters at the front of a model code, such as “CBA” in CBA-R35, are an identification symbol for exhaust emission regulations. MLIT sets these symbols in a notice. They are part of the model code, but they are not part of the chassis number in the sample above.

Japan VIN check: why a 17-digit VIN is often missing

The Japan Automobile Manufacturers Association (JAMA) explains the two systems in a logistics guideline. According to JAMA, cars built and sold for the Japanese domestic market must use the chassis number in the “model-serial” form set by MLIT (up to 17 characters), not a VIN. New cars exported from Japan use a VIN that follows the international standard. Cars imported into Japan from foreign makers also basically use a VIN. So two systems exist in Japan at the same time.

A used car that was first registered in Japan and then exported keeps its Japanese chassis number. That is why a tool that only checks 17-digit VINs often cannot read it. The number is not wrong. It simply follows a different system.

Japanese chassis numberVIN
Used forMost cars built for the Japanese marketNew cars exported from Japan; most imported cars
FormModel, hyphen, serial17 characters under the international standard
Length17 characters or less17 characters
ExampleR35-DSG-00001(not covered in this guide)

JAMA uses the word “must” for domestic cars. MLIT’s notice still allows a VIN-style stamp as an exception. So a small number of domestic cars may carry a VIN. Do not reject a car only because its number has 17 characters, and do not reject it because it has fewer.

What a Japanese chassis number check can tell you

A chassis number is useful, but it has limits. Knowing them saves time and wrong orders.

QuestionCan the chassis number answer it?
Which model family is this car?Partly. The model part, such as R35 or HGC14, shows the chassis model.
Is this the same car as on the papers?Yes. Compare the stamp on the car with the number on the documents.
Which exact variant is it (equipment, specification)?No. Use the Specification No. and Classification No.
Which genuine parts fit?Not by itself. Parts searches need the variant numbers.
When was it first registered?No. Read the First Reg. Date on the inspection certificate or Export Certificate.

Some rules also protect the number. Only vehicle makers and parties designated by MLIT may stamp a chassis number. The stamp must be on a main part of the body, such as the frame or the cowl top panel, where it is easy to read. Nobody may erase or alter the number. If a car has no stamp, or the stamp is unclear, MLIT can order a new stamp or stamp it itself. This is called ex officio stamping (職権打刻). In the 2D code data, such a number begins with a 2-digit code in square brackets, for example [41]12345.

Check the stamp, not only the paper

Before you quote a job or order parts, read the chassis number on the car and compare it with the documents. If the model part does not match the Model on the papers, stop and ask the seller.

Where to find the Specification No. and Classification No.

The chassis number shows the model. To identify the exact variant, Japan uses two other numbers: the Specification No. (型式指定番号) and the Classification No. (類別区分番号). They exist for type-designated vehicles, which are mainly mass-produced passenger cars. MLIT calls other cars “general vehicles” (一般車), and they do not have these numbers.

Where you can read the two numbers depends on the documents you have.

DocumentSpecification No. / Classification No.
Export Certificate (輸出抹消仮登録証明書 / 輸出予定届出証明書)Printed. The form has fields named Specification No. and Classification No.
Electronic inspection certificate card (電子車検証)Not printed on the card face.
IC tag in the electronic inspection certificateStored. All current inspection certificate data is in the IC tag.
Record printout (自動車検査証記録事項)Printed. Given at the Transport Bureau with the card, until the end of December 2027.
2D code data defined by MLITStored as one combined field (up to 10 characters) for type-designated cars only.

Since the electronic inspection certificate was introduced, the card face shows only basic items. These include the registration number, the chassis number, the vehicle name and model, the engine model and the first registration date. Other data is in the IC tag. So if a seller sends you only a photo of the card, you will not see the two numbers. Ask for the Export Certificate or the record printout instead.

For a field-by-field explanation of the export document, see how to read a Japan Export Certificate.

Chassis number lookup steps for repair shops and exporters

  1. Read the chassis number stamped on the car.
  2. Compare it with the Maker’s serial number on the Export Certificate, or with the chassis number on the inspection certificate.
  3. Check that the model part matches the Model on the document.
  4. Find the Specification No. and Classification No. on the Export Certificate or the record printout.
  5. Use those two numbers to search parts and specifications.
  6. If the car has no Specification No., search by maker, model name and model code, and confirm with the seller.

This order works for both sides of the trade. Exporters in Japan can confirm the variant for their own inspection and preparation work. Repair shops and parts dealers in importing countries can confirm the variant before they quote a job or order a part.

Japan exports many used cars, so this situation is common. According to a JETRO report based on the Ministry of Finance’s trade statistics, Japan exported about 1.49 million used passenger cars in 2025. The UAE was the largest destination with about 220,000 cars, followed by Russia, Tanzania, Chile and Kenya.

How Carise helps

Carise (https://www.j-carnet.net/) is a data search system for the automotive industry, operated by JAPANCARNET CO., LTD. (日本カーネット株式会社). To be clear: Carise does not search by chassis number. It starts one step later. Once you have the Specification No. and Classification No., you can use them in two searches.

  • Genuine Parts Price Search: search genuine parts prices by the two numbers. It covers parts related to the statutory vehicle inspection (shaken). ¥4,000 / month excl. tax. See Japanese car parts prices.
  • Specifications Search: search vehicle specifications by the two numbers, or by maker or model name. See Japanese car specs by model.
  • Labor-Time Search: search the standard labor-time schedule (work points) by vehicle information or work category. ¥10,000 / year excl. tax. See Japan standard labor time.

On the Carise English page, the Specification No. is called the “model designation” number and the Classification No. is called the “category classification number”. They are the same numbers.

Conditions:

  • The screens are in Japanese only. Use your browser’s translation feature.
  • Contracts are only for companies in auto-related businesses.
  • You can try the service for up to two months.
  • Phone support is in Japanese only.
  • Payment is by credit card (Stripe).
  • Use the results for your own repair, quotation and inspection work. The Terms of Use prohibit commercial use of the information obtained, so do not resell or publish it.

Apply here: Carise application form.

Frequently asked questions

Why does my Japanese car not have a 17-digit VIN?
Most cars built for the Japanese market use a chassis number in model-serial form, up to 17 characters. JAMA explains that VINs are used for new cars exported from Japan and for most imported cars.
Is a chassis number with fewer than 17 characters fake?
Not for that reason. MLIT’s rule is 17 characters or less. Check the stamp on the car against the documents.
Can I find the exact variant from the chassis number alone?
No. The chassis number shows the model. The exact variant is shown by the Specification No. and Classification No.
The electronic inspection certificate does not show the Specification No. Where is it?
It is in the IC tag and on the record printout (自動車検査証記録事項). On an exported car, it is on the Export Certificate.
Can Carise search by chassis number?
No. Carise searches by Specification No. and Classification No., or by maker and model name.

Sources

Checked on 6 October 2026. Figures and procedures may change; check the latest official information.

Look up Japanese-market data with Carise

Carise is a data search system for businesses that repair, sell or export Japanese vehicles. Search genuine parts prices and specifications by model designation and category number. The screens are in Japanese; you can try it for up to two months.

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