Buying components for repairing or servicing a machine always runs the risk of running into incompatibility. The market is full of analogues, duplicates and original parts that may be visually identical, but differ in fitment dimensions. Exactly VIN code becomes the key that allows you to avoid mistakes and save money. Knowing the unique identifier, you get access to the exact catalog numbers that were used by the manufacturer when assembling your specific item.
Modern cross-number systems allow even a beginner to understand the manufacturer’s nomenclature. You don't have to be a professional auto mechanic or have access to closed dealer databases to find the information you need. It is enough to understand the logic of how directories work and know where to look. Vehicle identification number (Vehicle Identification Number) contains encoded information about the year of manufacture, assembly plant, engine and equipment.
In this article we will analyze the entire process: from searching for the number itself on the body to deciphering the results in online catalogues. You'll find out why original number more important than the name of the part, and how to distinguish a fake from a factory product at the order stage. This guide will help you feel confident when communicating with parts sellers and when ordering yourself through online stores.
Where to find the VIN code on the car and in documents
The first and most obvious step is to find the code itself. It is usually a 17-character combination of letters and numbers. Most often it can be seen through the windshield on the driver's side, in the lower corner. It can also be stamped on a metal plate located on the body pillar near the driver's door, under the hood on the shock absorber or on the side member. It is important that the numbers on the plate and on the body match.
If there is no physical access to the plate on the car or it is unreadable, the information can always be found in the documents. B Vehicle registration certificate (STS) or Vehicle Passport (PTS), this number is indicated in the corresponding column. The code is also duplicated in the MTPL/CASCO insurance policy and the service book. Mindfulness when rewriting numbers it is critical: the letters O, Q and I are not used in the code so as not to confuse them with the numbers 0 and 1.
⚠️ Attention: If you buy a car second-hand, be sure to check the VIN code on the body, in the documents and in the traffic police database. A discrepancy between even one digit may indicate theft, “designer” or broken numbers, which will create huge problems when registering.
Some manufacturers hide a duplicate plate in non-obvious places, for example, under the trunk mat or under the back seat. This is done to protect against corrosion and fraud. To accurately select spare parts, it is better to use data from the vehicle title, as they are guaranteed to be correct and correspond to factory records.
Structure and explanation of the identification number
Understanding how the VIN works helps not only in locating parts, but also in checking the vehicle's history. The issue is divided into three main parts. The first three characters are WMI (World Manufacturer Identifier). They indicate the country of origin and the plant itself. For example, code JF1 indicates a Subaru made in Japan, and XW8 indicates a Volkswagen plant in Kaluga.
The next six characters (positions 4-9) constitute the descriptive part VDS. Information about the model, body type, engine and transmission is encrypted here. It is this data that is most often used by catalogs to filter out unsuitable parts. The ninth character is often a control character; it is needed to verify the authenticity of the code by the algorithm, but does not carry technical information about the configuration.
The last part, from 10 to 17 characters, is called VIS (Vehicle Identification Section). The tenth character indicates the model year of manufacture (not to be confused with the calendar year!), and the eleventh character indicates the assembly plant. The remaining numbers are the serial number of the car on the assembly line. Knowing the year of manufacture, you can understand what changes in the design could have occurred during this period, since restylings often occur when model years change.
Table of correspondence of the 10th character of VIN to the model year
| Symbol | Year | Symbol | Year | Symbol | Year |
|---|---|---|---|---|---|
| L | 2020 | M | 2021 | N | 2022 |
| P | 2023 | R | 2026 | S | 2026 |
| T | 2026 | V | 2027 | W | 2028 |
Online directories and databases for searching
There are many resources for searching on your own. The most reliable are official electronic catalogs (EPC), such as Elcats, Partsouq or Japancats. They allow you to enter the VIN and see an explosion diagram of the assembly with exact part numbers. Free versions often have restrictions on the number of requests, but for a one-time purchase they are quite enough.
There are also aggregators that check the package according to VIN and offer to buy spare parts right away. This is convenient, but less informative than working with catalogs. You only see what the seller chose to show. For an in-depth analysis, it is better to use specialized sites where you can see all the modifications of the unit that were installed on your model in different years.
When working with catalogs, pay attention to the production dates of the part. Sometimes original number can be replaced with a new one (supersession). In good catalogs, old numbers are redirected to new ones. If you are looking for a part for an older car, make sure it is not discontinued or has a direct equivalent.
Step-by-step instructions for selecting parts
The selection process requires a systematic approach. First, determine which component system you are interested in: engine, suspension, body or electrical. Then find the corresponding group in the directory. For example, to search for brake pads you need to go to the section Chassis -> Brakes -> Front/Rear.
After selecting the diagram, find the desired element in the picture. Pay attention to the notes: often the same part has different numbers depending on the car's production date or engine size. The description may indicate: “until 05.2020” or “for 2.0 TDI engines”. Compare this data with the characteristics of your car.
☑️ Algorithm for selecting spare parts
When the number is found, write it down. Don't rush to buy the first part you come across using this number. Check to see if this number is obsolete. Often manufacturers update part numbers, and the new number completely replaces the old one, having improved characteristics.
⚠️ Attention: Never rely solely on the visual similarity of the part in the photo in the online store. Photographs are often illustrative in nature. The only guarantee of compatibility is matching the catalog number and checking by VIN.
Original, analogs and cross numbers
Having found OEM number (manufacturer number), you may notice that the original part is expensive. This is where analogues come to the rescue. Large manufacturers of spare parts (Bosch, Mann, Febi) produce products under license or in compliance with specifications, assigning their numbers to them. The process of searching for an analogue is called “crossing”.
In the databases, each original number corresponds to a list of substitutes. However, not all analogs are the same. There are premium brands whose quality is not inferior to the original, and there are budget options whose resource may be several times less. When selecting by VIN, you minimize the risk of buying an analogue that simply “does not fit” in size.
When searching for analogues, use proven catalogs of crosses. Enter the OEM number into the search and see the list of offers. Pay attention to the country of production: often the same brand has factories in Europe, China or Turkey, and quality may vary. Specifications must be completely identical to the original.
Common mistakes and how to avoid them
The most common mistake is confusion in engine modifications. For example, 1.6 MPI engines can have different power (90, 105 or 110 hp) and different intake systems. Attachment parts, timing belts and filters may vary. The VIN code allows you to accurately determine the engine code (usually letters in positions 4-6 or a separate column in the catalog).
The second mistake is ignoring the release date. During the life cycle of the model, the manufacturer may change the design of the unit. For example, change the shock absorber mount or the diameter of the brake disc. If the catalog says “until 10/2019”, and your car was manufactured in 11/2019, the part may not fit, even if the model is the same.
The third mistake is inattention to the configuration. The presence of ABS, ESP, climate control or a certain type of suspension (sport or comfort) directly affects the catalog numbers of spare parts. Always check the equipment specified in the VIN decoding with the actual equipment of your car.
Don't forget about the right and left sides. When ordering suspension parts, mirrors or optical elements, it is important to specify the correct side. In catalogs they are often designated as L (Left) and R (Right) or have different last digits in the number.
Check compatibility before purchasing
The final stage is verification. If you are purchasing from a large online retailer, use their “Check by VIN” filter. Upload the number and the system will highlight compatibility. However, the human factor has not been canceled, so a visual check of the description is mandatory.
When purchasing in an offline store, let the seller copy the VIN code from the vehicle title. It will take a minute, but will save you from an extra trip. Professional sellers always punch the part into the database before issuing the goods. If the seller says “it’ll do as it is” or “there’s no difference,” it’s better to refuse the deal.
Keep receipts and packaging until installation. Even when selecting by VIN, a manufacturing defect or hidden defect may be revealed. The ability to return a product is your most important consumer right.
Frequently asked questions (FAQ)
Is it possible to select spare parts by VIN if the car is not running?
Yes, you can. The VIN code is located in documents (PTS, STS) that do not require access to the car. You can find the code on your insurance policy or sales contract. The physical condition of the machine does not affect the ability to search for catalog numbers.
Does the catalog number always match the part number?
Not always. The part number may be changed to a newer one (supersession), or the part itself may be manufactured by a subcontractor who marks it with their own internal code. The main thing is the correspondence in the cross-number database.
Is it dangerous to buy parts using VIN online?
The risk is minimal if you use proven sites and calculate the VIN correctly. The only danger is inattention: a mixed up letter or number will lead to ordering a part for another machine. Always double check your entered information.
What to do if the part is not found according to the VIN?
This happens if there is an error in the database or if the car is assembled from various components (a rare case for official dealers, but possible for “designers”). In this case, you will have to select the part according to the parameters: measure the dimensions, the number of gear teeth, the type of connector and search by technical characteristics, and not by number.