How to Find Your Part Number

Finding the Right Part

Manufacturers use different part number formats and labeling methods. Use the quick guide below to identify part numbers from the most common brands we carry.

Pro Tip: Always check the part number of the component you’re replacing first. Matching the original part number is the fastest and most reliable way to ensure the replacement will fit correctly and function with all your vehicle’s features and options.

How to Spot a Part Number on Mercedes-Benz, Porsche Or Toyota Parts

Mercedes-Benz Part Numbers

Mercedes-Benz part numbers typically follow this format: A 123 456 78 90

You may also see it written as: 1234567890, A1234567890, or 123-456-78-90

Where to look:

• Molded or stamped into plastic housings

• Stamped into metal surfaces

• Printed on a white or silver sticker label

• Cast into aluminum components (like engine or transmission parts)

Tips:

• The “A” prefix is sometimes omitted — that’s normal

• Ignore small extra numbers (supplier codes or revisions)

• Focus on the main 10-digit Mercedes number

Porsche Part Numbers

Porsche part numbers usually follow this format: 123.456.789.00

They may also appear as: 12345678900 or with spaces instead of dots.

Where to look:

• Printed barcode label stickers

• Cast or molded into the part body

• Stamped into metal components

• Inside housings or under covers (common on modules)

Tips:

• The last two digits indicate revision/version

• Always match the full number including the last two digits

• Porsche labels often include a QR or barcode nearby.

Toyota Part Numbers

Toyota part numbers typically follow this format: 12345-67890

You may also see it written as: 1234567890

Where to look:

• White barcode label stickers (most common)

• Molded into plastic housings

• Stamped into metal parts

• Cast into aluminum components

• On Denso or supplier labels (ECUs, sensors, modules)

Tips:

• Always match both 5-digit groups (12345-67890) •

The last 5 digits identify the exact variation

• Toyota often uses supplier numbers alongside Toyota numbers — use the Toyota number when possible

• Some parts have multiple numbers — choose the full 10-digit Toyota format

Toyota labels often include:

• Toyota logo

• 10-digit part number

• Barcode

• Supplier (Denso, Aisin, etc.)

• Production code/date

Common Places to Check

If you can’t immediately see the number, check:

• Back or underside of the part

• Mounting tabs or flanges

• Connector areas

• Inside covers or lids

• Label stickers on flat surfaces

Part Number FAQs

Q: Can I match a part by VIN instead of part number?

A: Yes, VIN-based matching helps confirm correct parts, but always verify the OEM part number.

Q: Do part numbers change over time?

A: Occasionally — manufacturers may revise parts for production or design updates. Always use the latest number.

Q: What if my part number is worn off or unreadable?

A: Check for alternative labels, VIN-based lookup, or contact a certified parts supplier.

Q: Are supplier numbers the same as OEM numbers?

A: Not always. Supplier numbers may differ from the official OEM number — always prioritize the OEM number for fit and compatibility.

Contact Us: Call 916-545-8443 or email support@californiaautostore.com. Include your vehicle's VIN for the most accurate recommendations.