Have you ever noticed a mysterious abbreviation on a plate under the hood or in the documents for a car? AER next to the usual VIN code? Many drivers mistakenly think that this is a duplicate marking or a typo, but in fact AER-nomer plays a key role in vehicle identification - especially during registration, customs clearance or checking the history of the car. Unlike international VIN, which is assigned by the manufacturer, the AER number has national specifics and often raises questions among owners.
In this article we will look at what is hidden behind these three letters, why the AER number may not coincide with the VIN, where to look for it on cars of different brands (from Toyota up to Lada), and what to do if this number is missing or damaged. You will also learn how to check the history of a car using the AER code through the official databases of the traffic police and customs - information that will be useful both when buying a used car and when preparing documents in 2026.
What is an AER number: decoding and purpose
Abbreviation AER stands for Automobile Engine Registration (Registration number of a car engine), but in Russian practice this term has acquired a broader meaning. In fact, AER number is a unique vehicle identifier assigned at the customs clearance stage when importing a car into Russia or the countries of the Customs Union. It duplicates some of the information from the VIN, but may contain additional data relevant for local registration.
Main functions of the AER number:
- 🔹 Customs control: confirms the legality of importing a car into the territory of the Russian Federation/EAEU.
- 🔹 Registration with the traffic police: used when registering instead of VIN if the latter is not readable or missing.
- 🔹 Engine identification: in some cases contains data about the power unit (for example, for diesel cars).
- 🔹 History check: allows you to track facts of theft, restrictions or customs violations.
It is important that AER does not replace VIN code, but complements it. For example, on cars Hyundai Solaris or Kia Rio, assembled in Russia, both numbers may be the same, while on imported BMW X5 or Mercedes-Benz E-Class The AER is often different from the international identifier.
Where is the AER number on a car?
The location of the AER number depends on the make, model and year of the vehicle. In most cases it can be found in the following places:
| Location | Examples of brands/models | What does it look like |
|---|---|---|
| Windshield decal (lower right) | Volkswagen Polo, Skoda Octavia, Renault Duster | A sticker with an alphanumeric code, often next to the VIN |
| Engine compartment plate (on body or frame) | Toyota Camry, Mitsubishi Outlander, Lada Vesta | Embossed or engraved code on metal |
| Inside the glove compartment or on the door pillar | Ford Focus, Nissan Qashqai, Peugeot 3008 | Sticker or plate with "AER No" written on it |
| In documents (PTS, STS, EPTS) | All cars registered in the Russian Federation | Indicated in the column "Body number (frame, chassis)" |
By car American made (for example, Chevrolet Tahoe or Ford Explorer) the AER number can be duplicated on a special anti-corrosion plate under the hood. But on Japanese cars (type Mazda CX-5 or Subaru Forester) it is often looked for on the driver's door pillar - in the same place as the VIN.
If the AER number on the plate is erased or damaged, check it in the electronic vehicle passport (EPTS) through the portal State services. This will save time when registering with the traffic police.
What is the difference between AER and VIN: key differences
Although both codes serve to identify a vehicle, there are fundamental differences between them:
- 🌍 Origin: VIN assigned manufacturer at the factory, and AER - customs authorities when imported into the Russian Federation.
- 📜 Structure: VIN consists of
17 characters(letters and numbers), while AER can be shorter (from6 to 12 characters) and contain additional notations. - 🔧 Purpose: VIN is universal for all countries, and AER is used only in Russia and the EAEU countries.
- 🔍 Check: By VIN you can find out the vehicle’s equipment, and by AER you can find out the history of customs clearance and registration.
For example, at Toyota RAV4 A 2023 model year VIN may look like JTMBR31VXP5123456, and AER - as XTA2105012345. The first code will tell you about the model, year and manufacturer, and the second - about the date of customs clearance and the declaration number.
⚠️ Attention: If, when purchasing a used car, the AER number in the title does not match what is stamped on the body, this may indicate an alteration or falsification of documents. Check the car through the service traffic police or FCS.
How to check a car using AER number
The AER number provides critical information about your vehicle that a VIN check won't reveal. Here's what you can find out:
- Customs history: date and place of customs clearance, declaration number, country of import.
- Traffic police restrictions: arrests, bans on registration actions, facts of theft.
- Accident data: participation in serious accidents (if they were recorded by insurance companies).
- Real mileage: some services (for example, Autocode) compare AER data with maintenance reports.
To check, use official sources:
- 🔗 Traffic police website — will check for theft and restrictions for free.
- 🔗 FCS portal — will show customs history (declaration number required).
- 🔗 Autocode — paid report with full history (from
349 ₽).
☑️ Car check using AER
If the inspection reveals discrepancies (for example, the traffic police database lists a different body color or year of manufacture), this is a reason to refuse the purchase or ask the seller for clarification. It is especially dangerous if the AER lists customs debt - in this case, the car may be confiscated even after purchase.
What to do if the AER number is missing or damaged
Situations where the AER number is unreadable or missing are more common than you think. The reasons may be different:
- 🔥 Corrosion - on old cars (for example, VAZ 2107 or GAZelle) the signs are rusting.
- 🛠️ Interruption — criminal actions to hide the history of the car.
- 🏭 Factory defect - rarely, but happens on budget models (such as Datsun on-DO).
Algorithm of actions:
- Check the documents: PTS or EPTS must have a duplicate number.
- Contact the traffic police: The inspector can issue a certificate of compliance of the numbers.
- Do an examination: A forensic audit will show whether there was an interruption.
- Submit an application to the Federal Customs Service: If the number is erased naturally, customs can restore the data.
⚠️ Attention: If you buy a car without a clear AER number, you risk running into problems during registration. The traffic police may refuse to register, citing Order of the Ministry of Internal Affairs No. 399 (clause 15.3), which requires clear identification of the vehicle.
What happens if you drive without a readable AER?
According to the Code of Administrative Offenses of the Russian Federation (Article 12.1 Part 1), driving a vehicle with an unreadable identification number entails a fine 500–1000 ₽ or warning. However, repeated violations may result in a fine of up to 5000 ₽ or deprivation of rights for 1–3 months.
AER number on electric vehicles and hybrids: features
With the advent of electric cars (eg. Tesla Model 3, Nissan Leaf or Hyundai Ioniq 5) the identification system has become more complicated. On such cars, the AER number can:
- 🔋 Match the VIN if the car was officially imported by the dealer.
- ⚡ Complete with letter
E(for example,XTE2105012345), indicating an electric drive. - 📱 Be in electronic form - in the on-board computer menu (for example, on Tesla path:
Controls → Software → Additional Vehicle Information).
Important: on hybrids (such as Toyota Prius or Kia Niro) the AER number can contain data about both the internal combustion engine and the electric motor. This complicates the verification, so before purchasing such a car it is recommended to order an extended report from CarVertical or VinHistory.
Common mistakes when working with AER number
Even experienced car owners make mistakes related to AER. Here are the most common:
| Error | Consequences | How to avoid |
|---|---|---|
| Confusing AER with engine number | Incorrect car history check | Check the location: the engine number is usually on the cylinder block |
| Ignore discrepancies in documents | Problems when registering with the traffic police | Check all numbers through the traffic police and the Federal Customs Service before purchasing |
| Data in EPTS is not updated | Penalties for irrelevant information | After replacing body parts, update the EPTS through State Services |
One of the most dangerous mistakes is buying a car with a “clean” AER, but a problematic VIN. For example, a car may be listed as stolen according to international databases (such as Interpol), but have a “pure” Russian AER. To avoid this, always check both numbers!
The AER number is not just a duplicate VIN, but an identifier that can reveal hidden problems with a car (customs debts, interruptions, discrepancies in documents). Always check both codes before purchasing.
FAQ: Frequently asked questions about the AER number
Can the AER number be the same as the VIN?
Yes, on cars manufactured or officially imported into Russia after 2010, these numbers are often identical. However, on imported cars (especially from the USA or Japan), the AER is usually different.
What should I do if the AER number on the plate is erased, but it is on the PTS?
In this case, it is enough to present the PTS or EPTS to the traffic police during registration. If the inspector requires confirmation, you can order a certificate from the Federal Customs Service or conduct an examination.
Is it possible to find out the vehicle's equipment using AER?
No, you need a VIN for this. The AER number only contains customs clearance and registration information. Check the package through services like Vinformer.
What is the penalty for driving with an illegible AER number?
By Art. 12.2 Code of Administrative Offenses of the Russian Federation, driving a vehicle with an illegible identification number is punishable by a fine 500–1000 ₽. In case of repeated violation - up to 5000 ₽ or deprivation of rights.
Where can I find the AER number on a motorcycle or ATV?
On two-wheeled vehicles (for example, Yamaha YZF-R3 or CFMoto CF800) AER is usually stamped on the frame under the seat or on the steering column. It is also duplicated in the PTS.