Seat Exeo power loss and generator fault

The symptoms you describe do suggest an alternator issue. Have you checked the voltage output of the alternator while the engine is running? A significant voltage drop could indicate a failing alternator. I encountered a similar problem with my Volvo some time ago. Reduced engine power, warning lights, and difficulty starting pointed to a car electronics issue stemming from a faulty alternator. Was the serpentine belt inspected for wear or slippage?

Thank you for your response. I did a quick voltage check, and it seemed low, but I do not have professional equipment to measure correctly. When you experienced this issue on your Volvo, was the alternator replacement a straightforward process, or did you encounter any unexpected complications related to the car electronics? Did you measure the voltage drop, and what was the threshold?

In my case, the alternator replacement resolved the issue entirely. The voltage drop was significant enough to trigger the warning lights and affect engine performance. Given the symptoms you describe and the error code, it is highly probable that the generator is indeed defective. Considering the cost involved, it might be prudent to have a qualified mechanic perform a thorough diagnosis before proceeding with the alternator replacement. Was the serpentine belt tensioner also checked?

I appreciate your insights and sharing your experiences. It seems a defective generator was indeed the root cause. The alternator replacement was performed as suggested, and the serpentine belt was also replaced as a precaution. The car electronics are now functioning as expected. I am back on the road, although 960€ lighter.