Peugeot 308 hybrid throttle valve issue

Reduced power and a check engine light? Sounds like a pain. Throttle valve issues can definitely cause those symptoms, especially with modern hybrids that rely so heavily on precise air intake control for fuel efficiency. Has your fuel efficiency also taken a hit? And did you notice any changes in the way the engine sounds at idle?

Yes, my fuel efficiency has decreased noticeably, and now that you mention it, the engine idle does sound a bit rougher than usual. I'm not very familiar with the technical aspects of the throttle valve. Could a faulty throttle sensor also be the culprit? What's the typical replacement cost for something like this?

A decrease in fuel efficiency and rough idling definitely points towards the throttle valve. A faulty sensor could be the issue, but with your mileage and symptoms, it's more likely the entire unit is starting to fail. I would strongly recommend taking it to a workshop to get a proper diagnosis, but in my experience you are looking at replacing the throttle valve. The replacement cost for a throttle valve on your 308 is probably around 265€.

I took it to the workshop, and you were right; it was the throttle valve. The final bill came out to 265€, just as you predicted. I appreciate you confirming my suspicion and providing a realistic cost estimate! I'm back on the road now!