Focus on European vehicles
Most online resources are based on North American documentation. OBD2.eu focuses on European engines, emissions standards and typical failures. You will find generic EOBD codes along with manufacturer-specific variants for brands such as Renault, Peugeot, Citroën, Fiat, Volkswagen, Audi, Skoda, Seat, BMW, Mercedes-Benz, Opel, Volvo and many others. Particular attention is given to diesel technologies, particulate filters, SCR systems and AdBlue faults that are common on the European market.
What each DTC page contains
Every trouble code page follows the same structure so you always know where to look. After a clear definition of the code, you will find a summary of the fault, the most frequent symptoms, the most probable causes ordered by likelihood, step-by-step diagnostic guidance and possible repairs. A section explains whether it is safe to continue driving, and another lists the vehicles most affected in Europe. Finally, a short FAQ answers the most common questions asked by drivers and technicians about that specific code.
Practical information for diagnostics
The content on OBD2.eu is written to be useful both with basic ELM327 interfaces and with professional diagnostic tools. Explanations avoid jargon when possible but remain technically accurate so that you can use them directly in the workshop. The goal is not only to decode the meaning of a code but to help you understand the logic behind it and avoid common diagnostic mistakes such as replacing parts without proper testing.
Learning resources
Beyond individual codes, OBD2.eu also offers introductory articles about how OBD-II and EOBD work, what triggers a check engine light, how fault codes are structured, and the difference between generic and manufacturer-specific codes. These guides help beginners understand the basics while giving professionals a quick refresher they can share with their customers.
Start using OBD2.eu
To get started, read the code stored by your diagnostic tool, then type it in the search field at the top of the page. You can also browse codes by family, by manufacturer or by symptom using the navigation menu. Whether you are trying to clear a check engine light on your own car or preparing a detailed quote for a client, OBD2.eu is designed to provide the structured, reliable information you need to make the right decisions.
