Peugeot 3008 Check Engine Light Air Valve

Peugeot 3008 driver here! Check engine light, eh? Sounds familiar. Manifold pressure problems, maybe? Any engine stalling or idle problems along with it?

Yeah, there's been occasional engine stalling and some rough idling, especially when the engine is cold. Does that sound like your 'manifold pressure problems'?

Bingo! Vacuum leak somewhere, guaranteed. I bet it's the air valve like you suspected. I'd say save yourself the headache and take it to a workshop. They'll smoke test it and pinpoint the exact spot.

Took it to the shop, and you were right, it was the hose connection. Cost 175€. Thanks for the help!