Megane Hybrid Lean Engine Rough Running

I had a similar experience with my Megane. The symptoms sound awfully familiar. Did you check the air-fuel ratio? A lean condition can trigger the check engine light and cause rough running. I would start by inspecting the throttle body and mass air flow (MAF) sensor. Have you noticed any unusual smells, possibly indicating catalytic converter issues? These problems might also be related.

Thank you for your reply! I have not checked the air-fuel ratio yet, but I will do that right away. I did not notice any unusual smells. How did you resolve the issue you had with your Megane? Was it also related to the fuel injection system?

Yes, the root cause of my Megane's problem was a faulty fuel injector. The symptoms were nearly identical to what you described. After replacing the injector, the engine ran smoothly again. Given your symptoms and my experience, I would strongly advise you to have your local workshop check the fuel injectors as well.

I appreciate your input, I will take it to the shop. After diagnosis, it turned out to be a defective injector, just as suspected. The repair cost me 515€, but now it runs smoothly again! Thank you so much for the help!