How to Match OE Part Numbers Before Ordering Luxury Car Spare Parts Online

It’s 11 in the night. Your car stands lifeless in your garage. And even after going through dozens of articles and websites, you still can’t find a part that fits. 

If you order luxury car parts using only photographs, model names or a generic supplier number, you increase the risk of receiving an incompatible part.

A safer approach is to match the vehicle manufacturer’s part reference with your VIN, vehicle specification and the supplier’s cross-reference numbers. 

But how do you actually find out how to match OE part numbers to your required spare part?

Worry not, this blog will answer all your questions around OE numbers, and help you purchase spare parts more effectively:

Key Takeaways

• OE number refers to the code given by the vehicle manufacturer and is unique to your car. On the other hand, the OEM number is given by the part manufacturer.

• OE number carries all the specifications such as make, model, year, engine variant, and trim. It also tracks mid-variant updates and is referenced widely across part catalogues. 

• You can find OE numbers stamped on your original part, through your car’s VIN number, or through listings of websites like AtoZ Auto Parts. 

• There’s no universal format for OE numbers. Every vehicle manufacturer has their own. 

• When a part is superseded or revised, the part number also changes. Instead of assuming automatic fitment, clear it with the supplier. 

What an OE Part Number Actually Is (and Why It's Not the Same as an OEM Number)

OE part number refers to the code that your vehicle manufacturer (BMW, Mercedes-Benz, Volkswagen etc,) puts on the part. On the other hand, the OEM part number is the part manufacturer’s code. 

The OEM supplier may use a separate catalogue number for the same part. 

Sounds confusing? Let’s backtrack a little and start by understanding the difference between an OE part and an OEM part:

What is the Difference Between OE Parts and OEM Parts? 

Before buying luxury car spare parts online in India, knowing the distinction between OE and OEM is important. OE parts refers to the parts that were originally fitted in your car when it first came out of the factory. But this doesn't necessarily mean that the vehicle manufacturer produced that part. 

Car brands may design the parts and then outsource its manufacturing. So the company that manufactured the part and supplied it, say Bosch or Denso, is called Original Equipment Manufacturer (OEM). 

The supplier may sell the same or an equivalent application under its own brand and supplier part number. Whether that product is described as OE, OEM, OE-equivalent or aftermarket depends on the supply relationship, branding and the seller’s terminology.

For understanding OE number vs OEM number, this difference is crucial. Let us break it down through an example:

Suppose Bosch supplies an ignition coil to BMW for factory installation. BMW may assign that application an official BMW part number, while Bosch assigns the component its own supplier number. 

The BMW-labelled part is generally described as an OE part, and the Bosch-branded equivalent may be described as an OEM-supplier or OE-equivalent part. 

Its compatibility should still be checked against the BMW part number, VIN and catalogue application. A Bosch brake pad or spark plug is not automatically an OEM part for every BMW simply because Bosch supplies other BMW components.

OE Number vs OEM Number: What’s the difference? 

OE and OEM numbers help identify car parts, but they serve different purposes.

• OE number: Assigned by the vehicle manufacturer, such as Mercedes-Benz or BMW. The same OE number may apply to multiple compatible models, body styles, engine variants or production years.

• OEM supplier number: Assigned by the component manufacturer, such as Bosch, Denso, Continental, Delphi or ATE. It identifies the supplier's product, which may have a different number from the vehicle manufacturer's OE reference.

Example: Suppose you're buying a replacement part for a Mercedes-Benz C-Class. The standard-wheelbase and long-wheelbase variants may share the same OE part number if both use the same component. However, if Bosch manufactures that component, it may list the same part under its own supplier number.

Why Should You Search Parts With OE Number and Not OEM Number?

Searching parts by OE number is your best bet to get a luxury car spare part online in India that fits. It is the reference point for all auto parts manufacturers (aftermarket and OEM) and more specific than OEM number. However, the number should still be checked against your VIN and vehicle specification before ordering.

Here is why the vehicle manufacturer’s part number can be more useful than searching only by a supplier number:

1. Parts Update: Carmakers may revise parts because of design changes, supplier changes, production updates or corrected specifications. The vehicle catalogue may show a new part number, supersession or replacement relationship. Supplier numbers may also change separately, so check both the vehicle catalogue and the component manufacturer’s cross-reference. 

2. Part indexing: Be it online auto parts stores, aftermarket brands, or OEM manufacturers, everyone selling spare parts maps their parts to their OE number. When you search for your car’s part in their catalogue or a VIN number lookup, you’ll have to use the OE number for cross-referencing.
 
3. Broader search: Searching the vehicle manufacturer’s number may reveal genuine, supplier-branded and aftermarket alternatives for the same application. Searching the OEM number is also useful when you want that specific brand, but it may return fewer cross-brand alternatives.

Where to Find Your Car's OE Number

Finding the OE number isn’t all that hard. It can either be found directly from the original part, through VIN part number look up, or from a trusted auto parts store’s listing. Let’s get into the details:

Option 1. Through the Original Part

The number on the old part is a useful starting point because it shows what is currently fitted. However, it may be a superseded number, an aftermarket equivalent or even a previously installed incorrect part, so verify it against the VIN and catalogue application.

Before buying luxury car spare parts online in India, take a look at your old part. You might not be able to see the OE number right away due to oil and grease build up. A quick wipe would do the trick. 

For small parts, you might need to use a magnifying glass. Take a clear photograph of the marking before cleaning the part. Avoid applying ink, paint or chemicals that could obscure the code or damage the label.

How to Identify the OE Number?

Some parts only have the brand logo and the OE number engraved on it. But on others, you may find many other numbers and letters. Don’t give up just yet. Here are some easy ways to identify the OE number:

Brand’s OE Format: Many manufacturers use recognisable numbering conventions, but formats vary by brand, part family, market and catalogue. A number’s appearance is only a preliminary clue, not proof that it is an OE number or that it fits your vehicle. For example, the BMW OE number format is 11 digits and no letters such as ‘11 61 7 123456’. Find out the format of your car brand’s OE and match the engravings to it.

Google Search: If you identify a combination of characters that seems like a plausible OE number, run it through Google once. Search results can help identify a possible number, but a listing appearing in Google does not confirm authenticity or compatibility. Use the result only as a cross-reference and verify it against the VIN and vehicle specification. You can Google whether the sequence you’ve identified is the OE number or not. 

Option 2: Through Your Car’s VIN Number

If you can’t identify the OE number on your old part or the part was replaced at an earlier service, you can find it through VIN (Vehicle Identification Number) part number look up. Locate the VIN on your car (laid out in detail in further sections) and run it through your carmaker’s authorised parts catalogue.

For BMW: RealOEM.com looks up exact OE numbers by system from a VIN or chassis code. Just open the site, navigate to explore catalogue, and enter the last 7 digits of your VIN in the search bar titled ‘Serial Number.’ 

Then, select the exact part you’re searching for and voilà! You’ve got your part number. You can even search by car model, make, and manufacturing date. 

For Audi, Volkswagen, Skoda, SEAT: ETKA is the Volkswagen Group's own electronic parts catalog, keyed to VIN. But, it is dealer/workshop-access only.

For Mercedes-Benz: For Mercedes-Benz, official parts systems are generally accessed through dealer or workshop channels. An authorised dealer can use the VIN to confirm the applicable part number, production application and any supersession.

Option 3: On AtoZ Auto Parts' Website

AtoZ Auto Parts listings may show several identifiers, including the vehicle manufacturer’s part reference and supplier or aftermarket cross-reference numbers. These references can help you compare products, but they do not replace VIN-based verification.

For example, a Mercedes-Benz front brake pad listing shows OE A 007 420 55 20 alongside cross-reference numbers 2430601 and P06067. And a BMW air filter listing shows OE 13718518111 alongside E1071L and LX2796.

Matching any one of the numbers on a listing against your old part number or a VIN-based catalog will confirm the parts fitment.

Using Your VIN to Narrow Down the Exact Spec

As VIN uniquely identifies your vehicle, it can be used with your old part's stamped number. This forms the strongest combination for confirming an exact match before ordering.

The 17-character VIN follows ISO-3779 which specifies the content and structure of the number:

First three characters (World Manufacturer Identifier): Identify the maker. 

Characters 4-9 (Vehicle Descriptor Section): Encode body style, engine, and drivetrain. This includes the general characteristics of your car. 

The last eight characters (Vehicle Identifier Section): Include the model year and a unique production sequence number that clearly identifies your car. 

Where to find the VIN number?

Common VIN locations include the lower windscreen near the dashboard, the driver-side door jamb or pillar, the vehicle identification plate and official registration or insurance documents. The exact location varies by make, model and market.

A good practice is to check the owner’s manual before locating the VIN. Here are some common places where top brands usually have the VIN located at:

BMW: Check the front windshield from the driver’s side.

Mercedes-Benz: It’s usually found right below the seat on the driver’s side. 

Audi: You can find the VIN stamped on the parts around the engine. 

Reading OE Number Formats by Brand

Knowing the format not only helps you identify the OE number on the part, but also acts as a quick reliability check of the auto parts store you plan on purchasing from. A number in the wrong format for the claimed brand is a red flag.

Here’s a little information about the OE number formats according to car brands:

• BMW OE Number Format: Numeric only with 11 digits and no letters. For example 34116888457.

• Land Rover: Alphanumeric sequence often starting with ‘LR.’ For example, LR040878.

• Audi/Volkswagen Group: Alphanumeric sequence of typically 9-11 characters and tied to the ETKA catalog.

• Volvo: Numeric characters going typically up to 8 digits. For example, 32347591.

• Mercedes-Benz: Mercedes OE part number is an Alphanumeric sequence starting with ‘A’ followed by up to 10 digits. For example, A 007 420 55 20 (XXX XXX XX XX).

Superseded and Revised Numbers

Your car’s manufacturer doesn’t just produce parts once. Rather, they keep on upgrading and improving.

So, when a part is ‘revised’ with new features, better materials or let’s say their supplier changes, then carmakers change the part number. That changed number is what a superseded part number means.

A listed supersession usually indicates that the newer number is intended to replace the older application, but confirm whether additional hardware, software coding, programming or related components are required.

A single trailing digit or suffix-letter change can mean a genuinely different, non-interchangeable part. It could mean a different connector, the opposite side of the car, or a different vehicle application entirely rather than a simple revision.

So, it’s best to not take a risk if a listing shows a different number than the one stamped on your old part. The safer option is to ask the seller whether it's an official supersession before ordering, especially for electronics, sensors and safety-related parts.

Conclusion

A model name and product photograph are rarely enough to identify the correct replacement part. 

Vehicles from the same series may differ in mounting points, connectors, engine application, production date, side, market specification or installed equipment.

For this reason, any part’s OE number is usually the most useful catalogue reference to ensure compatibility for luxury car spare parts online in India. You can find it on your part, through your VIN or cross-referenced at AtoZ Auto Parts’ listings. 

At AtoZ Auto Parts, we list every part with its OE number, OEM number, and car’s model. If any confusion still remains, you can contact our team and they’ll help you match the VIN/OE number to your car’s exact part. 

Frequently Asked Questions

1. What's the difference between an OE number and an OEM number? 

OE generally refers to the vehicle manufacturer’s part reference or original-equipment application. OEM refers to the company that manufactured or supplied the original component, such as Bosch, ZF, ATE or Denso. That supplier may assign its own catalogue number and several supplier numbers may cross-reference to one vehicle manufacturer’s part number.

2. Where do I find my car's VIN in India? 

Common VIN locations include the lower windscreen, driver-side door jamb or pillar, vehicle identification plate and official registration or insurance documents. The exact location varies by model and market. For parts lookup, use the complete VIN when contacting a dealer or supplier. 

3. Can I use a part with a similar but not identical number? 

No, that won’t be safe to do. A different final digit or suffix can mean a different connector, side, or vehicle application. In such cases, confirm with the seller first if it’s a supersession or a completely different part. 

4. Is the number on my old part always the right one to search? 

It is a useful starting point, but not an absolute guarantee. The part may be a superseded number, an aftermarket equivalent or an incorrect replacement fitted previously. Cross-check it against a VIN-based catalogue and the vehicle’s exact specification.