Each car has a unique identifier - VIN code, which consists of 17 characters. This number not only helps track the history of the car, but also serves as a key to its technical characteristics. However, not everyone knows what is in the VIN number All letters of the Latin alphabet and numbers are not used. Why is this happening? The fact is that some characters are excluded on purpose to avoid confusion when reading the code - both by humans and by scanners.
For example, letters I, O and Q will never appear in the VIN number because they are easily confused with numbers 1 and 0 or among themselves. And the figure 0 Although it is present, its use is strictly regulated by standards. In this article we will look in detail at which characters are prohibited in the VIN code, why they were excluded, and how this affects checking the car when purchasing or registering.
VIN formation standards: who banned some characters and why
The VIN code is regulated by two key standards:
- 📜 ISO 3779 — an international standard that defines the structure and format of a vehicle identification number.
- 📜 SAE J853 - a standard from the Society of Automotive Engineers (USA), which details the rules for the North American market.
Both documents clearly state which symbols allowed, and which ones - prohibited. The main reason for excluding some letters and numbers is minimizing errors when manually entering or scanning. For example, the letter O visually indistinguishable from numbers 0 in some fonts, and I may be confused with 1 or even with a vertical line on a damaged sign. This is critical, because an error in even one character makes the VIN invalid.
Interestingly, the standards not only prohibit symbols, but also distribute them among sections of the VIN code. For example, in serial part (last 6 characters) letter cannot be used U, as it is reserved for trailers in some countries. And the figure 0 can only stand in certain positions - it cannot be used in 9th character (check mark).
Prohibited letters in the VIN number: complete list with explanations
There are 26 letters in the Latin alphabet, but in the VIN code you will only find 23. Three letters are excluded forever:
| Forbidden letter | Reason for exception | What can be confused with |
|---|---|---|
| I | Looks too much like a figure 1 and a vertical line |
1, |, l (lowercase L) |
| O | Indistinguishable from a number 0 in most fonts |
0, Q (in some styles) |
| Q | May be confused with O or 0, and also rarely used in automotive terminology |
O, 0, G |
In addition, in the VIN number you will never see letters of the Russian alphabet or symbols of other languages - only Latin. This rule applies even to cars manufactured in countries with a non-Latin written language (for example, Japan or China). Manufacturers are required to use transliterations or Latin equivalents.
One more nuance: the letter U although it is allowed, but not used in serial numbers (last 6 characters) from most manufacturers. This is due to the fact that in some countries U denotes trailers or special equipment, not cars.
If there is a letter in the VIN code I, O or Q - this is 100% fake or a typo. Such a number is invalid and requires verification through official databases (for example, traffic police or CarVertical).
Numbers in the VIN number: which can be used and which cannot
The situation with numbers is simpler: in the VIN number all numbers from 0 up to 9, but with reservations:
- 🔢 Number
0not used in the 9th character (check sign), since this sharply increases the likelihood of an error when calculating the checksum. - 🔢 Numbers
1and7sometimes avoided serial numbers (last 6 characters) so as not to confuse them with letters I and Z accordingly. - 🔢 Number
6may be prohibited in some positions by individual manufacturers (for example, BMW or Mercedes-Benz), since it can easily be confused withGin handwritten notes.
It is important to understand that check mark (9th character) is calculated using a special algorithm and can be only number or letter X. If in this position there is O, I or Q, this is guaranteed to be fake. The same applies to other prohibited characters in any part of the VIN code.
Example of a correct VIN code: WAUZZZ4LZBD123456. There are no prohibited letters here, and numbers are used without restrictions (except for the 9th character, where B - valid letter). And here is the number WAUZZZ4LZIO123456 no longer valid due to letter I.
Why are there no spaces or dashes in the VIN code?
ISO 3779 and SAE J853 standards require the VIN to be a continuous string of 17 characters with no delimiters. Spaces, dashes or other punctuation marks will make the number invalid and unsuitable for scanning by traffic police or customs equipment.
How prohibited symbols affect vehicle inspection
If a prohibited character is detected in the VIN number, it automatically makes it void. The consequences can be serious:
- ⚠️ Refusal of registration in the traffic police - the system simply will not accept such a number.
- ⚠️ Problems with customs — the car will not be able to clear customs, since the VIN will not pass the database check.
- ⚠️ Suspicion of counterfeit — such numbers are often found on stolen or “killed” cars.
- ⚠️ Inability to check history through services like Carfax or Autocode.
In practice, errors in the VIN code occur in three cases:
- Typing error - for example, instead of
5introducedS(they are similar in some fonts). - Damage to the sign - if the symbols are erased or corroded, they may not be read correctly.
- Deliberate forgery - scammers deliberately replace symbols to hide the car’s history.
To avoid problems, always check your VIN with multiple sources: plate on the body, documents (PTS, STS) and report from the official database. If at least one of them contains a prohibited symbol, this is a reason for a thorough check.
Take a photo of the number plate on the body|Check with the data in the PTS and STS|Check through the online service (Autocode, CarVertical)|Make sure there are no prohibited characters (I, O, Q)|Calculate the checksum of the 9th character-->
Where are the most common errors with characters in the VIN code?
Some VIN positions are more vulnerable to errors than others. Here are the most problematic areas:
| Position in VIN | Common mistake | How to avoid |
|---|---|---|
| 1–3 (WMI - World Manufacturer Index) | Letters are confused B and 8, D and 0 | Use the official WMI reference (for example, on the website SAE) |
| 4–8 (VDS - vehicle description) | Replacement 1 on I or 0 on O |
Check the technical specifications of the model |
| 9 (check mark) | Incorrect calculation (for example, instead of X put 7) |
Use an online checksum calculator |
| 10 (model year) | Letters are confused Y (2000) and A (1980 or 2010) | Check the letters and years correspondence table |
Particular attention should be paid to last 6 characters (serial number). Here, manufacturers sometimes use internal designations that do not always comply with generally accepted standards. For example, Toyota can use letter Z in the serial number, and Volkswagen - avoid it.
If you are in doubt about the correctness of a symbol, use magnifying glass or flashlight - often the true outline becomes visible from a different angle. Also remember that the original VIN plates have clear embossing without traces of interruption.
If the VIN code contains at least one prohibited character (I, O, Q) or an incorrect check mark, this is a reason to refuse to purchase a car until the circumstances are clarified.
What to do if a prohibited character is detected in the VIN code
If you encounter a suspicious character in the VIN number, follow the algorithm:
- Check the plate on the body — often an error occurs when copying numbers from documents. The original sign is usually located:
- 🚗 On the driver's door pillar (for most brands).
- 🚗 Under the hood (on the front panel or mudguard).
- 🚗 On the floor under the driver's seat (for some Japanese cars).
If you have already purchased a car with an incorrect VIN number, Do not try to “correct” documents yourself - this is criminally punishable. Instead:
- 📋 Submit your request to traffic police to check the legality of the number.
- 📋 If the car is a credit car, notify the bank of suspicion of fraud.
- 📋 If you confirm the fake, file a police report.
If the seller refuses to provide the car for inspection of the VIN code or documents, this is a reason to refuse the deal. A legitimate seller will not hide such information.
Examples of real VIN codes: correct and incorrect
To better understand what correct and incorrect VIN numbers look like, let's look at a few examples:
| Example VIN | Status | Reason |
|---|---|---|
JT2BF22KXW0123456 |
✅ Correct | No prohibited characters, check mark (9th) - X (acceptable). |
WAUZZZ4LZBD1023456 |
❌ Erroneous | In the 10th character there is 0, but the letter O prohibited (although here it is a number, it is easy to confuse). |
1G1ZT54806F123456 |
✅ Correct | There are no prohibited letters, numbers are used correctly. |
VF1BM900XDM123456 |
❌ Erroneous | In the 8th character there is 900 - letters O not here, but the sequence of numbers looks suspicious (interruption is possible). |
WDB2100321A123456 |
✅ Correct | Typical VIN for Mercedes-Benz, there are no prohibited characters. |
Please note that even if the VIN code visually looks correct, this does not guarantee its authenticity. Fraudsters often use real VIN numbers from other cars (so-called "clones"). So always check your history against multiple databases.
If you doubt the authenticity of the VIN code, you can use free checksum calculation services (for example, on the website VINDecoderz). It is enough to enter the first 8 characters and 10–17 for the system to calculate the correct 9th character. If it doesn't match, it's a fake.
FAQ: Frequently asked questions about characters in the VIN number
Can the VIN code contain the letter E or other Cyrillic characters?
No, in the VIN code Only Latin letters and Arabic numerals are allowed. Cyrillic, hieroglyphs or other characters automatically invalidate the number. Even if the car was made in Russia or China, its VIN code will be in Latin.
Why do some VINs have an X and some don't?
Letter X can be used in two cases:
- How test sign (9th character), if the checksum calculation gave such a value.
- B serial number (last 6 characters) - some manufacturers (for example, Ford) use it to designate certain series.
The letter itself X is not prohibited, but its presence in an unexpected position (for example, in WMI) may indicate a fake.
What happens if, when registering with the traffic police, they find a prohibited character in the VIN code?
Most likely you will refuse registration until the circumstances are clarified. The inspector must check:
- Does the VIN on the body and in the documents match?
- Are there any traces of interruption on the plate?
- Does the number pass verification against the database of stolen cars?
If suspicions are confirmed, the car may be seize for examination, and the owner - to be held accountable for forgery of documents (Article 327 of the Criminal Code of the Russian Federation).
Is it possible to restore the VIN if the plate is damaged?
Yes, but only through official channels:
- Contact brand dealer — they can restore the number from the database.
- Order examination in an accredited organization (for example, NIIAT).
- If the car is registered, request the data at traffic police.
How to distinguish the number 0 from the letter O in the VIN code?
In original VIN codes the number 0 and letter O are not used at the same time, but if in doubt:
- 🔍 Look at font: in most signs
0has rounded edges, and O - more oval shape. - 🔍 Check with documents — if it’s in the PTS
0, and on the body O, this is a sign of a fake. - 🔍 Use magnifying glass — often under magnification you can see embossing or microcracks that indicate interruption.
If doubts remain, contact forensic expert for metal plate analysis.