Determining the month of manufacture of a Japanese car by body number

Buying a car from Japan is always a lottery in which experienced players know how to read hidden marks. Release date is one of the key parameters that influence the real cost of the car, the condition of the tires and the residual life of technical fluids. Many buyers mistakenly rely only on the year of manufacture indicated on the title or auction sheet, losing sight of the exact month of manufacture, which is often hidden in the markings.

The Japanese auto industry is famous for its meticulousness, and every part, including the body, has a unique identifier. Understanding how VIN code or the chassis number corresponds to the calendar, avoiding the purchase of an “old” new car or a car that has been sitting in the dealer’s warehouse for a long time. This knowledge gives leverage when bidding and helps to objectively assess the condition of the vehicle.

In this article we will analyze the complex encoding systems used by leading manufacturers in the Land of the Rising Sun. You will learn to find hidden numbers in documents and on metal nameplates that will tell the true life story of your potential acquisition even before leaving the port.

The importance of the exact production date for assessing the condition of a car

Why is it so important to know not just the year, but the specific month of assembly? The point is that conservation A car in a dealer's warehouse or at a port has its limits. If more than 6-8 months have passed between the release date and the date of first sale or removal, this is already considered a long downtime that requires careful inspection.

First of all they suffer batteries and rubber products. Even if the mileage according to the documents is zero, the chemical processes in the battery are ongoing. Knowing the month of manufacture, you can predict the need to replace the battery before purchasing. In addition, it helps to identify repainted elements: if the body date is March, but the headlight glass is dated May, there is a clear contradiction.

⚠️ Attention: If the difference between the date of manufacture of the car and the date of production of tires or glass exceeds 2-3 months ahead of the latter, this is a signal of possible repair or replacement of parts before sale.

Also, the exact date helps in the selection of spare parts. Japanese manufacturers often conduct restylings and make design changes mid-model year. Knowing the month makes it easier to find the correct catalog numbers for order items that may have changed during the production run.

VIN code structure and date location in the 10th character

The main identification tool for most vehicles exported from Japan is VIN code (Vehicle Identification Number). This is a 17-digit alphanumeric code in which all information about the car is encrypted. To determine the release date, we are interested in the structure adopted by the North American standard, which is actively used by the Japanese for export versions.

The key element here is 10th character code. This is what indicates the model year of manufacture. However, it is worth understanding the difference between a model year and a calendar year. The model year may be several months ahead of the calendar year. For example, a vehicle produced in late 2023 may be labeled for the 2026 model year.

To decipher the 10th character, a cyclic system is used, where letters and numbers alternate. The letters I, O, Q, U, Z are not used to avoid confusion with numbers and other letters. Knowing this code can determine the year, but getting the month often requires looking at other parts of the code or the auction sheet.

Table of correspondence between the 10th character of the VIN and the years of manufacture

2010 - A, 2011 - B, 2012 - C, 2013 - D, 2014 - E, 2015 - F, 2016 - G, 2017 - H, 2018 - J, 2019 - K, 2020 - L, 2021 - M, 2022 - N, 2023 - P, 2026 - R, 2026 - S. Note that after 2000 the letter A went again, so context is important.

It is important to note that the VIN rarely contains direct month information that is obvious to a European user. Often the month is “hidden” in the last six digits, which are the serial number, and internal databases of the manufacturing plant are needed to decipher them. That's why auction sheet becomes a more useful document in this context.

Decoding the auction sheet: where to look for the month of issue

The auction sheet is the main document accompanying a car at auction in Japan. Unlike VIN, where the information is encrypted, here the data is presented in a structured form. At the top of the sheet, usually on the right or left, there is a block with technical information, where Year/Month (Year/Month).

The format for recording the date on the auction sheet is standardized: YYYY/MM. For example, record 2018/05 means that the car was produced in May 2018. This is the most reliable source of information, since the data is entered by an auction employee based on checking documents and markings on the body.

However, you should be careful about terminology. Sometimes the date of first registration in Japan may appear rather than the date of issue. To distinguish them, you need to look at the mileage and general condition. If the mileage is minimal and the registration date is significantly later than the production date, it means the car was in storage.

• 📅 Production Date — the immediate date of assembly of the car on the assembly line.
• 📝 Registration Date — date of first registration in Japan (may differ from the date of issue).
• 🚢 Export Date — date of shipment for export, which is indicated on the bill of lading.

Professional resellers always check the date on the auction sheet with the markings on the parts. If the sheet says May 2020, but the timing belt is dated March 2021, this is a clear sign that the belt has been changed, perhaps due to a long period of use or pre-sale preparation, which requires additional questions.

Specifics of labeling for different Japanese brands

Each Japanese concern has its own characteristics in the marking of bodies and the location of information about the production date. Although the VIN code is unified, additional nameplates can tell more.

Toyota often places a plate with VIN and weight information on the B-pillar on the driver's side. On the same plate the month and year of production are sometimes duplicated in the format MM/YYYY. Models Lexus this information is also duplicated under the hood on a metal plate.

Honda and Acura tend to place the main plate on the end of the driver's door. Here it is important to look not only at the VIN, but also at a separate sticker with a barcode, where the assembly date is often written. Honda has a peculiarity: they can use an internal factory code, which is deciphered only through dealer databases.

Nissan and Infiniti usually follow the general standard of placing the sign on the counter. However, some models, such as Nissan Skyline or GT-R, there may be a separate certificate of conformity with the exact date of assembly, since these are small-scale or iconic models.

Brand	Plaque location	Date Format	Features
Toyota	B-pillar / Engine compartment	MM/YYYY	Often duplicated in the VIN database
Honda	Driver's door end	YYYY-MM	There is an internal factory code
Nissan	B-pillar	MM/YY	Separate certificate possible
Mazda	B-pillar/Under the hood	YYYY/MM	Clear markings on the nameplate

If you find that your VIN and date plate shows signs of tampering, riveting, or is a different color from the factory rivets, this is a serious cause for concern. Replacing the sign may indicate that the car was recovered from a serious accident or has a criminal history.

Indirect signs of age: glass, belts and tires

When direct documents are unavailable or raise doubts, indirect signs come to the rescue. All glass elements of the car (windshield, side windows, mirrors) are marked with the production date. Typically these are digital dots or numbers around the glass manufacturer's logo.

Production date analysis seat belts - one of the most reliable methods. There is always a date tag on the belt tongue, at the bottom of it. The belt's production date must always be before or the same as the vehicle's assembly date. If the belt was produced later than the car, it was changed.

Also worth a look plastic elements interior and wiring. Electrical wiring connectors are often marked with a date. If the harnesses are dated later than the body, the wiring may have been changed due to moisture or an accident.

⚠️ Attention: Inconsistency of dates on windows and seat belts does not always mean fraud. The glass could break during transportation, and the belt could be replaced under warranty. But the combination of such factors requires careful verification.

The influence of the month of issue on the market value

In Japanese car culture, there is a concept of “freshness” of a car. A car released late in the calendar year (November-December) is often valued lower than a similar one released early in the next year (January-February), even though they may technically be the same model. This is due to the fact that in the documents it will be listed as “older” according to the model year.

On the other hand, cars released early in the model year may command a higher price because they are perceived by buyers as being the newest in their lineup. Knowing the month of release allows resellers to play on this difference, buying “December” cars at the price of “November” ones, and selling them as “new models” for next year.

For diesel engines, the month of manufacture is also important from the point of view of environmental standards. In Japan and Europe, emissions standards are changing in stages. A car released on the 31st of one month may meet one set of standards, while one released on the 1st of the next month may meet different, more stringent standards. This affects the possibility of customs clearance and further operation in a number of countries.

Online services and databases for verification

In the digital age, it is no longer necessary to manually decipher codes on glass. There are many online services that, based on the VIN code, provide the complete specifications of the car, including the exact release date. Popular databases such as CarVX, Autocheck or specialized Japanese services that aggregate information from auctions.

However, it is worth remembering that free versions of such services often provide truncated information. Full data download, including service history and exact dates, usually requires a fee. But the investment in checking the VIN before buying a car from Japan pays off completely, saving you from buying a “constructor” or a car with mixed numbers.

When using online databases, pay attention to the source of the data. If the information is taken from another country's customs declaration, the date may be incorrect. The most reliable data is obtained directly from Japanese auction houses or official dealerships.

Can you trust the date on the title when buying a used car?

The date in the PTS (Vehicle Passport) is the date of issue of the document, and not the date of production of the car. The “Year of Issue” column can only contain the year. Therefore, the PTS is not a document by which the month of assembly can be determined. You need to look at the STS (where the month is sometimes indicated) or at the factory markings.

What should I do if the VIN on the body does not match the auction sheet?

This is a critical situation. Most likely, the car was in a serious accident and the body parts (or the entire body) were replaced. It is not recommended to buy such a car without a thorough examination from a criminologist, as problems with registration and legal purity may arise.

How can I find out the month of issue if the auction sheet is lost?

If the auction sheet is lost, all that remains is to rely on the VIN code (the 10th character will give the year) and markings on parts (windows, belts, airbags). You can also try to request information from an official dealer of the brand by providing the VIN code, although they do not always share such information with individuals.

Does the month of manufacture affect the warranty?

The warranty usually begins on the date of sale to the first owner (date of registration), not on the date of manufacture. However, if the car has been in storage for a long time (more than a year from the date of manufacture), the dealer may shorten the warranty period for certain components or require replacement of technical fluids before sale.