Finding the correct spare part for a European vehicle can be confusing. Mercedes-Benz, BMW, Audi, Porsche and Land Rover all use different part-numbering systems, and a single vehicle can have multiple versions of the same component.

Understanding the difference between a vehicle body code, model code, catalogue group and OE part number can make parts identification much easier.

In this guide, we explain the basic structure of OE part numbers for Mercedes-Benz, BMW, Audi, Porsche and Land Rover.

What Is an OE Part Number?

An OE (Original Equipment) Part Number is the manufacturer's reference number assigned to a specific vehicle component. It is used in the manufacturer's parts catalogue and is commonly used to identify, cross-reference and order replacement parts.

For example:

BMW 31206795959

Mercedes-Benz A2043200389

Audi 8K0407271AJ

The complete number is important. Do not assume that a partial number is sufficient because different suffixes or revisions can represent different versions of a part.

1. Mercedes-Benz OE Part Number Structure

Example:

A 204 320 03 89

A simplified way to understand the number is:

A | 204 | 320 | 03 | 89

Example Explained

A2043200389

• A = Mercedes-Benz part-number prefix
• 204 = 204 series/type family
• 320 = main parts/assembly group
• 03 89 = specific identifier within the part-number structure
• A2043200389 = complete OE part number

The important point is that the entire number should be treated as the OE reference. The internal meaning of the final digits can vary according to Mercedes-Benz's numbering convention and part family.

Example Vehicle Identification

Mercedes-Benz C-Class W204

Here:

• Mercedes-Benz = Brand
• C-Class = Model
• W204 = Body/Generation
• A2043200389 = OE Part Number

Body code and OE part number are not the same thing.

2. BMW OE Part Number Structure

BMW commonly uses an 11-digit numerical OE part-number format.

Example:

31 20 6 795 959

or:

31206795959

A practical breakdown is:

31 | 20 | 6 | 795959

Example Vehicle

BMW X5 F15

• BMW = Brand
• X5 = Model
• F15 = Body/Generation
• 31206795959 = OE Part Number

Therefore:

F15 is NOT the OE part number.

It is the vehicle's body/generation designation.

The complete BMW OE number is:

31206795959

3. Audi OE Part Number Structure

Audi/VAG part numbers often contain an alphanumeric platform/type prefix followed by a component group, part identifier and sometimes a letter suffix.

Example:

8K0 407 271 AJ

Structure:

8K0 | 407 | 271 | AJ

Example Explained

8K0407271AJ

• 8K0 = Audi/VAG type or platform reference
• 407 = component group
• 271 = specific part identifier
• AJ = revision/version suffix
• 8K0407271AJ = complete OE number

Audi part numbers can have important suffix letters. Therefore, when searching for an Audi part, it is better to use the complete OE number, including the final letters.

4. Porsche OE Part Number Structure

Porsche part numbers frequently use the vehicle type/generation as the first three digits.

Example:

997 110 201 00

Structure:

997 | 110 | 201 | 00

Example

Porsche 911 997

Here:

• 997 = vehicle/type generation
• The remaining numbers identify the component and its version.

Porsche's type numbers should not automatically be treated as the complete OE part number.

5. Land Rover OE Part Number Structure

Land Rover uses several different part-number families, including numbers beginning with prefixes such as LR, as well as historical prefixes such as STC, ERR and ESR.

Example:

LR014363

Structure:

LR | 014363

Unlike some Mercedes, BMW or Porsche examples, you should not assume that every group of digits inside an LR number represents a vehicle model or catalogue group.

Example Vehicle

Range Rover L405

• Range Rover = Model
• L405 = Generation/Type
• LRxxxxx = OE Part Number

OE Number vs Body Number

This is one of the most important concepts when working with automotive parts.

Remember:

Body Code ≠ OE Part Number

For example:

BMW X5 F15 31206795959

• BMW = Brand
• X5 = Model
• F15 = Body/Generation
• 31206795959 = OE Part Number

Why VIN Verification Is Important

A vehicle model and body code alone may not be enough to identify the correct spare part.

The same model can have different:

• Engines
• Production dates
• Facelift versions
• Transmission types
• Drive systems
• Brake systems
• Suspension configurations
• Left-hand/right-hand specifications
• Equipment options

VIN-based identification is therefore one of the safest ways to confirm vehicle application. Online European parts catalogues also commonly support searching by VIN or part number.

Quick OE Number Reference Table

How to Search for the Correct Part

When looking for a replacement part, use this order:

Step 1 — Identify the vehicle

Brand → Model → Generation/Body Code

Example:

BMW → X5 → F15

Step 2 — Identify the vehicle specification

Check:

• Model year
• Engine
• Engine code
• Transmission
• Drive type
• Production date
• Left/right position
• Front/rear position

Step 3 — Find the OE Number

Check the original part, manufacturer's catalogue or VIN-based catalogue.

Step 4 — Search the Complete OE Number

For example:

31206795959

rather than searching only:

312067

Step 5 — Check Cross-Reference Numbers

An OE number can be cross-referenced with supplier and aftermarket numbers, but the specifications should still be verified before ordering.

Common Mistakes When Searching for European Auto Parts

Mistake 1: Confusing Body Code with Part Number

W204, F15, 8K, 997 and L405 identify vehicle/type generations or platforms; they are not necessarily the complete part number.

Mistake 2: Using Only Part of the OE Number

A missing suffix can lead to an incorrect match.

Mistake 3: Ignoring VIN

Two vehicles with the same model and generation may still require different parts.

Mistake 4: Ignoring Revision/Suffix

Audi and other manufacturers may use letters or suffixes to identify different versions.

Mistake 5: Assuming Every Number Has the Same Structure

Mercedes, BMW, Audi, Porsche and Land Rover use different numbering conventions. There is no universal OE-number decoding formula.

Final Checklist Before Ordering

Always verify:

1. Brand
2. Model
3. Body/Generation Code
4. Model Year
5. Engine
6. Engine Code
7. Position
8. Left/Right
9. Front/Rear
10. Complete OE Part Number
11. OE revision/suffix
12. VIN, when available

Final Rule

Vehicle information identifies the car.

The OE part number identifies the component.

VIN verification confirms the application.

For European luxury vehicles such as Mercedes-Benz, BMW, Audi, Porsche and Land Rover, using the complete OE number together with vehicle/VIN information is the most reliable approach to reducing incorrect fitment and returns.