How to Find Your Car's OEM Part Number (Step-by-Step)

Every genuine part has an exact OEM part number assigned by the manufacturer. Finding yours is the single most reliable way to guarantee a correct match — here's how to track it down.

Step 1: Check the Old Part Itself

Most OEM components have their part number stamped, printed, or embossed directly on the part — often on a sticker, cast into plastic housings, or printed on a metal tag. Look on flat surfaces, mounting brackets, or the underside of the component. It's usually a string of numbers and letters, sometimes with the manufacturer's logo nearby.

Step 2: Check Your Service Documentation

Your vehicle's service booklet, owner's manual, or any invoices from previous dealership repairs often list part numbers for components that have been serviced or replaced before.

Step 3: Use Your VIN (Chassis Number)

Your Vehicle Identification Number (VIN, or Fahrgestellnummer in German) encodes your exact vehicle configuration — model, production year, engine variant, and factory options. Many dealership parts systems and online lookup tools can cross-reference your VIN to the exact OEM part numbers fitted to your specific vehicle, which is especially useful when a component was changed across production runs.

Step 4: Ask a Dealership Parts Counter

If you're stuck, a dealership parts department can usually look up the correct part number using your VIN, even if you don't intend to buy from them — most are happy to provide the number itself.

Once You Have the Number

Search that exact number directly — this removes any ambiguity around fitment, model year variations, or regional part differences.