Renault Movano Reduced Engine Power

Hey there, those symptoms definitely point towards a rich running condition. A faulty injector is a prime suspect, especially with those kilometers on the clock. Have you checked for any other potential causes, like a faulty Mass Airflow (MAF) sensor or a vacuum leak? A bad MAF can definitely mess with your air-fuel ratio. Also, when was the last time you had your catalytic converter checked? A clogged one can also cause similar issues.

Thank you for the quick reply. I have not yet examined the MAF sensor or checked for vacuum leaks. How would I go about testing the MAF sensor and identifying potential vacuum leaks in a Movano?

Alright, testing the MAF sensor usually involves using a multimeter to check its output voltage or frequency while the engine is running. There are plenty of videos online showing the correct values for your engine. As for vacuum leaks, a mechanic uses a smoke machine to pump smoke into the intake. It'll come out anywhere there's a leak. Honestly, with all those symptoms, and considering the potential impact on the catalytic converter, it would probably be best to get it checked out by a workshop. They can do a proper diagnostic and pinpoint the exact cause of the rich mixture. You really don't want to risk damaging your catalytic converter with excessive fuel.

Thank you for the information provided. I took the Movano to a workshop, and it was indeed a defective fuel injector. The repair, including parts and labour, came to 515€. The engine is now running smoothly.