EU Vehicle Registration Guide
What Is a Certificate of Conformity (CoC) and Why You Need It
A practical guide to the EU Certificate of Conformity (CoC): what it is, when it’s required, what it contains, and how to obtain the right document without delays.
What is a Certificate of Conformity (CoC)?
A Certificate of Conformity (often called CoC or COC certificate) is an official document that confirms a vehicle complies with the relevant EU type-approval rules. In simple terms: it’s proof that your car matches the technical and environmental specifications approved for road use in the European Union.
The CoC is frequently requested when you register a vehicle in another EU/EEA country, especially for imported cars or vehicles previously registered abroad.
Quick definition: A CoC is the “EU compliance passport” for your vehicle — used by registration authorities to verify technical data (emissions, masses, dimensions, engine, etc.) quickly and consistently.
Why you may need a CoC
Registration offices and inspection bodies rely on standardized technical data. If the vehicle’s details are not already in the local database (or if the car comes from a different country), authorities may ask for a CoC to avoid manual verification and reduce errors.
- Faster registration: a CoC helps authorities identify the exact approved configuration.
- Less paperwork: it can reduce extra inspections or technical verification steps.
- Accurate data: CO₂, weights, dimensions, power — all in one official document.
- Fewer rejections: correct documentation prevents “missing info” issues at the registration desk.
Need a CoC for your vehicle?
If you have your VIN (Vehicle Identification Number), you can usually verify eligibility and start the request quickly.
Start your CoC request Secure checkout • Support included
What a CoC includes (typical data fields)
A CoC is primarily a technical + compliance document. Exact fields can vary by vehicle category and year, but common items include:
| Category | Examples of data | Why it matters for registration |
|---|---|---|
| Vehicle identification | VIN, make/brand, model, variant/version | Confirms the exact approved configuration |
| Type-approval | EU type-approval number | Shows compliance with EU rules |
| Masses & dimensions | Mass in running order, max weight, axle loads, dimensions | Used for taxation, registration, and safety checks |
| Emissions | CO₂ values, emission standard (e.g., Euro 6) | Impacts registration eligibility and taxes in many countries |
| Powertrain | Engine capacity, power (kW), fuel type | Required to create the national registration record |
| Tyres & noise | Approved tyre sizes, noise level | May be requested for inspection and compliance |
Note: authorities may request additional documents depending on country and vehicle history (previous registration, invoice, proof of ownership, etc.).
When is a CoC required? (most common situations)
You are more likely to need a CoC when a vehicle is new to the country’s registration system. Below are typical real-world cases:
| Scenario | You will likely need a CoC if… | Alternative documents (sometimes) |
|---|---|---|
| Registering an imported car (EU → EU) | The car was first registered in another EU country | Local technical inspection report or national data sheet |
| First registration of a vehicle | It’s a newly purchased vehicle that must be entered into the system | Manufacturer documentation / dealer paperwork (varies) |
| Vehicle data missing or incomplete | Authority database doesn’t match your car’s configuration | Technical verification or type approval extract |
| Special versions / variants | Different engine/trim affects emissions, weight, tyres, etc. | Technical data sheet (not always accepted) |
Important: Requirements vary by country and by vehicle history. A CoC is commonly accepted across the EU, but some cases may require extra checks (e.g., vehicles imported from outside the EU/EEA, heavily modified vehicles, or older models).
CoC vs. registration document vs. technical data sheet
These are often confused. Here’s the short version:
- CoC: proves EU type-approval compliance and lists standardized technical data.
- Registration certificate: proves the vehicle was registered in a specific country (ownership/registration status), not necessarily full EU technical specs.
- Technical data sheet: may list specs, but may not be the same as an EU type-approval CoC and may not be accepted everywhere.
If a registration office asks specifically for a “Certificate of Conformity” or “COC”, sending a generic technical sheet can waste time. Always match the requested document type.
How to get a CoC (fast checklist)
In most cases, the key is providing accurate vehicle identification so the correct document can be issued. Prepare these items:
- VIN (17 characters) — double-check for typos (0/O, 1/I confusion).
- Current registration document (if already registered somewhere).
- Owner ID (may be required depending on request type and policy).
- Delivery details — email and/or shipping address (depending on format).
If you run a specialized CoC service site, this is also where you place internal links: Stellantis brands, CoC FAQ, Support.
Start in 60 seconds
Have your VIN ready. We’ll guide you through the request and help avoid common mistakes.
Tip: Upload clear photos of documents to prevent delays.
Common mistakes that cause delays (and how to avoid them)
- Incorrect VIN: one wrong character can make matching impossible.
- Low-quality photos: unreadable documents slow down verification.
- Mismatch of model/variant: special trims and engine variants must be exact.
- Assuming all documents are equivalent: a technical sheet is not always a CoC.
- Missing context: importing from outside the EU can require extra steps.
Pro tip: Copy/paste the VIN from a digital source when possible, and always verify it against the VIN plate or registration document.
FAQ: Certificate of Conformity (CoC)
These are the most common questions people ask before registering an imported vehicle or requesting a CoC.
Is a CoC valid in all EU countries?
A CoC is designed for EU type-approval compliance and is widely accepted across EU/EEA registration systems. However, each country can have additional local requirements (tax, inspection, proof of ownership, etc.).
Can I register a car without a CoC?
Sometimes yes, but you may be asked for alternative technical verification or additional inspections. A CoC usually reduces friction and speeds up the process.
Do I need a CoC for a used car?
Often yes when the used car is imported or being registered in a country where its technical data is not already available in the national system.
Can I get a CoC using only the license plate?
In most cases, the VIN is the safest and most reliable identifier. A plate number alone may not be sufficient because plates can change across countries and registrations.
What if my vehicle is imported from outside the EU/EEA?
Non-EU imports can require additional compliance checks, and a standard EU CoC may not apply in the same way. In those cases, authorities may request extra documentation or inspections.
How long does it take to receive a CoC?
Processing times vary depending on vehicle data availability and the correctness of submitted details. Providing a correct VIN and clear documents is the fastest way to avoid delays.
Ready to request your CoC?
Start your request with the VIN to reduce errors and speed up the process.
If you’re unsure what you need, check our CoC FAQ or contact support.