Finding the right used automotive part is much easier when you have the OEM number. The OEM (Original Equipment Manufacturer) number is the unique reference code assigned by the vehicle manufacturer that identifies the exact component fitted to your car.
At Partoria, searching by OEM number is the fastest and most accurate way to locate matching used parts sourced from European vehicle dismantling centers. Here’s a clear guide on how to find it.
Why the OEM Number Matters
Two cars that look identical can have different parts depending on the engine, production date, or equipment level. Relying only on the car model often leads to the wrong part. The OEM number eliminates that guesswork and helps you compare listings with confidence.
1. Check the Existing Part (Most Reliable Method)
The best source is the part you’re replacing. Manufacturers stamp, engrave, print, or stick a label with the OEM number on the component itself.
How to do it:
- Remove the part if it’s safe and practical to do so.
- Clean it thoroughly with degreaser, brake cleaner, and a soft brush or rag. Dirt, oil, and rust often hide the number.
- Use a flashlight (and a small mirror if needed) to inspect flat surfaces, edges, housings, and any labels or metal tags.
- Photograph the number clearly before you forget it.
Important: Distinguish the true OEM part number from a casting or molding number. Casting numbers are usually raised or recessed characters molded into the metal or plastic and identify the mold used. The actual OEM number is typically a longer alphanumeric code, often on a separate label or cleanly stamped.
Common locations on popular parts
- Alternator: Label on the rear housing or stamped near the wiring connector.
- Starter motor: Label or stamp on the outer casing or solenoid.
- Headlight: Moulded or printed on the rear of the housing (often visible with the bonnet open).
- Brake caliper: Cast or stamped into the body, often on the inboard face.
- Radiator: Label on the top or side header tank.
- ECU / Engine control unit: Label on the housing (note both the vehicle manufacturer number and any supplier number).
- Turbocharger: Stamped or engraved on the compressor housing (cold side).
- Door mirror: Label inside the housing (you may need to remove or tilt the glass).
If the label is missing or unreadable due to heat or age, look for stamped digits on flat machined surfaces.
2. Use Your Vehicle’s VIN
The 17-character Vehicle Identification Number (VIN) encodes the exact specifications of your car, including engine, transmission, and production details.
- Find the VIN on the dashboard (visible through the windscreen), the driver’s door jamb sticker, registration documents, or insurance papers.
- Contact a dealership parts department with your VIN — they can usually look up the OEM number for free.
- Use manufacturer or reputable online electronic parts catalogs (EPCs) that accept a VIN search. These show exploded diagrams and the correct part numbers for your specific build.
3. Check Service Records and Manuals
- Previous repair invoices and service books often list the OEM numbers of parts that were fitted.
- The owner’s manual lists numbers for common maintenance items such as filters, belts, and spark plugs.
- Workshop manuals and online parts diagrams for your year, make, model, and engine can also help.
4. Tips for Success
- Always note whether the part is left-hand or right-hand drive / left or right side of the vehicle.
- Some numbers are superseded by the manufacturer. If you have both the original and the new number, search for both.
- Take clear photos of the part and any numbers — they help when comparing listings.
- For complex parts (gearboxes, ECUs, turbochargers), note any additional codes (gearbox code, software version, etc.).
Search for Your Part on Partoria
Once you have the OEM number, enter it directly into the search bar on Partoria. You’ll see available used parts with detailed photos and descriptions so you can compare condition and fitment before ordering.
Our used automotive parts come from European vehicle dismantling centers, giving quality components a second life. Every order comes with a 14-day return policy, a one-year warranty, and fast delivery.
Ready to find your part?
Search parts by OEM number now
If you still can’t locate the number, contact us with your vehicle details and a photo of the part — we’re happy to help.
Partoria – Find the right used part. Search by OEM number, part name, or vehicle model.