Learn what the OEM code is, how to find it, and how to use it to purchase compatible and safe auto parts. A practical 2025 guide with advice from a professional.
Buying a car part seems easy.
Just one click, a thousand online offers... but how can you be sure you're buying the right one ?
The answer lies in one number: the OEM code .
If you know how to read and use it well, you avoid costly mistakes, unnecessary returns and – above all – you guarantee your car's compatibility and safety .
This 2025 guide explains what the OEM code is, how to find it, and how to use it to buy spare parts without surprises .
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✅ What is the OEM code?
OEM = Original Equipment Manufacturer .
✅ It is the official code assigned by the car manufacturer to a specific spare part.
✅ It is unique and standardized : it identifies the piece precisely.
✅ It is used by workshops, spare parts dealers and manufacturers to ensure compatibility.
Why is it important?
✔️ Avoid compatibility errors.
✔️ Allows you to compare offers.
✔️ Helps choose between original and aftermarket equivalent.
🏷️ Where to find the OEM code
✅ 1️⃣ Direct on the replacement
Many pieces have the code printed or engraved:
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Brake pads
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Oil or air filters
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Straps
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Batteries (often first equipment only)
✅ 2️⃣ On the original packaging
Official spare parts boxes and packages always show the OEM code.
✅ 3️⃣ In the use and maintenance manual
For some components, you can find equivalent codes or specifications directly.
✅ 4️⃣ At workshops and dealerships
An authorized technician can verify the correct code using the vehicle identification number (VIN).
✅ 5️⃣ On professional databases
Expert spare parts dealers have access to electronic catalogs that cross-reference chassis and OEM part numbers to ensure a match.
⚙️ How to read and understand an OEM code
OEM codes are not universal : each car manufacturer has its own standards.
📌 Some examples:
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Fiat / Alfa Romeo / Lancia: often 7-10 digit numbers.
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PSA (Peugeot / Citroën): alphanumeric format with spaces (e.g. 1612784680).
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Volkswagen / Audi / Skoda / Seat: often with letters and hyphens (e.g. 04L 129 711 E).
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Renault: numbers with separators or letters (e.g. 7701477696).
✅ Important: Don't simplify it!
It must be copied entirely and accurately to ensure correct results.
💡 How to use OEM code to buy online
⭐ 1️⃣ Copy the exact OEM code
It's your “master key” to avoiding mistakes.
⭐ 2️⃣ Use it in internal site search engines
Many reputable online shops have a search bar for OEM codes.
⭐ 3️⃣ Check compatibility
The best suppliers indicate the compatible OEM codes in the product data sheet.
⭐ 4️⃣ Compare alternatives
The same manufacturer can offer the original spare part and equivalent quality aftermarket versions.
⭐ 5️⃣ Check seller reviews and reliability
Price is not enough: you need a guarantee of quality.
✅ Benefits of knowing the OEM code
✅ Time saving
➡️ Avoid returns, compatibility errors, and unnecessary waits.
✅ Save money
➡️ You can compare offers and also choose certified aftermarket.
✅ Safety and reliability
➡️ Ensure correct assembly without risking failures or electronic errors.
✅ Total transparency
➡️ You know exactly what you're buying.
⚠️ Mistakes to avoid
❌ Use only the photo as a reference → similar shape ≠ compatible.
❌ Ignore version differences → same model can have engine or year variants.
❌ Trust those who do not indicate OEM → unreliable or generic shops.
❌ Do not verify the return → essential in case of error.
🛠️ Professional tips to avoid mistakes
✔️ Photograph the label of the old spare part.
✔️ Keep original packaging for future comparison.
✔️ Request the code from the workshop, even using the VIN.
✔️ Prefer sellers who clearly state compatible codes.
✔️ Consider after-sales support.
🔎 OEM and Aftermarket: How They Work Together
Many parts manufacturers make both OEM and aftermarket parts .
📌 Real-world example:
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Bosch, Valeo, Magneti Marelli produce original equipment but also sell aftermarket parts.
✅ Often the same piece , only without the car manufacturer's logo and at a more convenient price.
✅ If the website or the spare parts dealer tells you “compatible with OEM xxx”, it is a sign of seriousness.
🤝 Why rely on a professional
A spare parts dealer or specialized technician:
⭐ Check OEM codes for you.
⭐ Can read and interpret cards and catalogs.
⭐ Know the differences between versions and engines.
⭐ Offers you quality original or aftermarket alternatives.
✅ Trusting a professional means buying with confidence and without surprises.
🔗 Want to learn more?
👉 Read our guide on original vs. compatible spare parts to understand how to really choose.
✅ Conclusion
The OEM code is not a minor technical detail.
It is the key to ensuring compatibility, safety and savings when purchasing spare parts.
✅ Get well informed.
✅ Find the correct OEM code.
✅ Compare offers and check compatibility.
✅ Trust those who really know the sector.
Because the right spare part isn't just a part: it's your peace of mind on the road. 🚗🔧
