Seat Exeo Diesel Rough Running Engine

I had a similar issue with my Exeo. Rough running and the check engine light illuminated. Have you checked the airflow sensors? They can sometimes cause similar symptoms before more serious issues manifest. It might be worth investigating before assuming the worst.

Thank you for your input. Regarding the airflow sensors, did you experience any specific error codes related to them, or was it more of a process of elimination? Also, were there any noticeable changes in fuel economy or performance tuning issues prior to the check engine light appearing?

In my case, there were no specific error codes for the airflow sensors. It was more of a process of elimination, as the symptoms were consistent with other potential issues. The rough running was quite noticeable, and there was a slight decrease in fuel economy. I would recommend taking it to a workshop. They can perform a proper diagnosis and reset procedure, if necessary.

I appreciate you taking the time to share your insights. I took your advice and consulted with a trusted workshop. As suspected, the issue was indeed a defective injector. After replacing it and performing the reset quantity drift compensation, the engine is now running smoothly again. The total repair cost was 515€.