Anyone buying a used car will sooner or later come across the COC documents — and usually quite a few misconceptions about them. One of the most persistent myths is that you cannot pass the roadworthiness inspection without a COC. The truth is more nuanced: for the regular periodic vehicle inspection, you do not need this document at all.
It becomes especially important when you want to register an imported used car in Germany. If the COC is missing in this case, a technical report under Section 21 StVZO may be required instead, and this usually costs significantly more than obtaining a replacement COC document. According to ADAC, the replacement document usually costs between €70 and €180. In this guide, you will learn when you really need COC documents for a used car, what role they play at the TÜV and what you should check before buying a second-hand vehicle.
What Are COC Documents for a Used Car?
COC stands for Certificate of Conformity, also known as the EC Certificate of Conformity. It confirms that your specific vehicle corresponds to the type approved in the European Union. The document brings together all the technical data required by the registration authority, including:
- vehicle dimensions
- weights and axle loads
- emissions values
- noise levels
For a used car, one point is particularly important: the COC is vehicle-specific and actually belongs to the car, not to the owner. It should therefore be handed over when the vehicle is sold. We explain exactly what the documents contain and what they look like in detail in our article on what a COC document contains and how it looks.
Do You Need COC Documents for Every Used Car?
The short answer is: no. Whether you need the COC at all depends mainly on where the vehicle comes from.
| Origin of the used car | COC required for registration? |
|---|---|
| Already registered in Germany, re-registration or change of owner | No, the data is already included in the vehicle registration documents |
| Import or re-import from another EU country, first registration in Germany | Usually yes, alternatively manufacturer data confirmation or a Section 21 technical report |
| Re-registration after more than seven years deregistered | Possible: COC, manufacturer data confirmation or technical report |
If a used car has already been registered in Germany, you do not need a new COC for a normal re-registration or change of ownership. The technical data is already recorded in Vehicle Registration Document I and Vehicle Registration Document II. You simply re-register the car with these documents; nothing more is required.
The situation is different for an imported used car, for example a re-import from France, Belgium or the Netherlands. In this case, the German registration authority usually requires the COC in order to determine the technical data for the German registration documents. Strictly speaking, the COC is not the only legally possible document. If a valid EC type approval exists, a manufacturer data confirmation or a technical report may also be accepted. In practice, however, the original COC document is usually the fastest and most cost-effective option.
An exception applies to vehicles that have been deregistered for more than seven years. For this type of re-registration, the COC, manufacturer data confirmation or a technical report may be required again.
COC Documents and the TÜV: Periodic Inspection, Section 21 and Individual Approval
When people mention TÜV, many buyers mix up two very different procedures: the regular periodic vehicle inspection and the technical individual approval of an imported vehicle. The COC plays no role in one of them, but it can be decisive for the other. Understanding the difference can save you unnecessary worry — and sometimes a lot of money.
| Criterion | Periodic inspection, Section 29 StVZO | Individual approval, Section 21 StVZO |
|---|---|---|
| Purpose | Check technical condition and road safety | Determine technical data for registration |
| When | Regularly, usually every two years | Once, if no COC is available |
| COC required? | No | Replaces the missing COC |
| Relevant document | Vehicle Registration Document I | Full technical approval report issued by the expert |
| Effort | Standard inspection | Significantly more complex and more expensive |
The Periodic Vehicle Inspection, Section 29 StVZO: Do You Need the COC for This?
No. The periodic vehicle inspection, commonly referred to as the TÜV inspection in Germany and usually required every two years, checks the technical condition and road safety of a vehicle that is already registered. The decisive document is Vehicle Registration Document I, not the COC. You therefore do not need to present or even own the COC document for the regular inspection.
A missing COC is therefore not a reason for failing to receive the inspection sticker. The periodic inspection mainly checks:
- brakes
- lighting
- emissions values
- the general technical condition
The type approval documented by the COC, on the other hand, is not the subject of the regular periodic inspection.
Individual Approval Under Section 21 StVZO: When TÜV Replaces the Missing COC
The situation is completely different when an imported used car is to be registered in Germany for the first time and no COC is available. In that case, the registration authority must obtain the technical data in another way.
This is where TÜV comes in, as do DEKRA, GTÜ or KÜS. An expert examines the vehicle as part of a full technical approval report under Section 21 StVZO and determines all the values that would normally be listed in the COC. This procedure, also known as individual approval, is significantly more complex and expensive than simply presenting a COC document.
In other words: the COC saves you the technical report under Section 21. If the document is available, the registration authority takes the data directly from the manufacturer. If it is missing, you must either obtain a replacement COC or take the detour via an expert inspection. Another possible option is manufacturer data confirmation.
Check the COC Certificate When Buying a Used Car
The best approach is to prevent the issue from becoming a problem in the first place. Keep the following points in mind when buying a used car:
- Ask for the COC certificate before buying, especially for re-imports and newer used cars.
- If the car has already been registered in Germany, you usually do not need to worry.
- If the COC is missing for an import, ask the seller to provide it or negotiate the price accordingly.
Include the replacement cost in your calculation: depending on the manufacturer, it usually ranges between €70 and €180, according to ADAC, as of 2026.
COC Document or Vehicle Registration Document II: What Is the Difference?
Finally, there is one common misunderstanding: the COC is not the vehicle ownership document. What many people still call the “vehicle brief” in Germany is now called Vehicle Registration Document II and is issued by the German registration authority. The COC, on the other hand, comes from the manufacturer and certifies the EU type approval.
| Feature | COC document | Vehicle Registration Document II |
|---|---|---|
| Issued by | Vehicle manufacturer | German registration authority |
| Certifies | EU type approval and conformity | Registered keeper and vehicle registration |
| Technical data | Very detailed | Less detailed |
| During registration | Usually retained by the authority | Handed over to you |
The two documents complement each other, but they do not replace one another. The COC actually contains more technical details than Vehicle Registration Document I and Vehicle Registration Document II combined. During registration, the authority usually keeps the COC and issues the registration documents to you.
