What is a Certificate of Conformity (COC)?
Updated 2026-07-20 · 6 min read
A Certificate of Conformity (COC) is an official document issued by a vehicle's manufacturer that confirms the vehicle conforms to an EU type-approved model under Regulation (EC) 2018/858. It certifies that your specific car meets the technical and environmental standards required to register it anywhere in the European Union and the EEA.
What information does a COC contain?
A COC is a standardised, multi-page document. It lists more than 50 technical data points that describe your exact vehicle configuration, all tied to its Vehicle Identification Number (VIN).
Because the format is harmonised across the EU, a registration authority in any member state can read a COC issued in another country and accept it without further national tests.
- Vehicle Identification Number (VIN) and type-approval number
- Make, commercial name and vehicle category (for example M1 for passenger cars)
- Engine power, displacement and fuel type
- CO₂ emissions, pollutant class (Euro standard) and noise levels
- Dimensions, masses, axle loads and towing capacity
- Tyre and rim specifications and maximum speed
Why do you need a COC?
The main reason is registration. When you register a car in an EU country other than the one where it was first sold, the authority needs proof that the vehicle already meets EU standards. The COC provides that proof and lets you skip a costly individual inspection.
You typically need a COC when importing a vehicle from another EU country, re-registering after an export, or replacing lost paperwork. Without it, many authorities require a full individual approval, which is slower and more expensive.
Who issues a Certificate of Conformity?
Only the vehicle manufacturer, or an agent it has authorised, can issue an original COC. Governments and registration offices do not produce them, and no third party can lawfully print a valid one.
Coceu is an independent intermediary. We do not issue COCs ourselves; we request the original document from the manufacturer's official channel on your behalf and deliver it digitally and on paper. That distinction matters: your COC is always a genuine manufacturer document.
COC vs. registration certificate: what is the difference?
A COC is not the same as a registration certificate (such as the German Zulassungsbescheinigung or the UK V5C). The COC describes what the vehicle is and proves it is type-approved; the registration certificate proves who may use it on the road in a specific country.
You usually present the COC once, at registration. The authority then issues the national registration document. Keep your COC afterwards. You may need it again if you move the car to another country.
Key takeaways
- A COC is a manufacturer document proving your car matches an EU type-approved model under EC 2018/858.
- It lists 50+ technical data points tied to your VIN and is recognised across all EU and EEA countries.
- You mainly need it to register an imported or re-imported vehicle without an individual inspection.
- Only the manufacturer can issue an original COC; Coceu sources it from the official channel for you.
Frequently asked questions
Is a COC mandatory in the EU?
For any car that was EU type-approved, a COC is the standard document used at registration. If you are registering a vehicle in a new EU country, the authority will normally ask for it.
How long is a COC valid?
A COC does not expire. It describes the vehicle as built, so the same certificate remains valid for the life of the car unless the vehicle is substantially modified.
Can I use a photocopy of my COC?
Most registration authorities require the original document with the manufacturer's security features. A photocopy or scan is generally not accepted for registration.
Does every car have a COC?
Every car that received EU whole-vehicle type approval has one. Vehicles built before the harmonised system, or imported from outside the EU, may not. Those often need an individual approval instead.