Clio engine power loss

Sounds familiar. I had a similar problem with my Clio. Have you checked the manifold pressure sensor? A faulty one can cause those symptoms – the light, power loss, poor response, and extra fuel consumption. It could be related to your suspect vacuum leakage.

Thanks for the quick reply! Where is the manifold pressure sensor located? And how can I check if that is faulty? Is it easy to replace? What do you mean by 'manifold'?

The manifold pressure sensor, also known as a MAP sensor, is usually mounted on the intake manifold. The intake manifold distributes the air to the cylinders. As for checking it and replacing it yourself, I wouldn't recommend it unless you really know what you're doing. With that mileage and vacuum leak suspicion, there might be other underlying problems. I'd suggest taking it to a workshop to get it properly diagnosed.

Thanks for the advice! I took it to the workshop as you suggested. Turns out it was indeed the manifold pressure sensor, likely caused by a vacuum leak! They replaced the sensor, and the car is running perfectly again. Cost me 235€, but totally worth it. Thanks again for pointing me in the right direction!