Peugeot 406 rough idle stalling smoke

Sounds familiar. I had similar symptoms on my old Opel Astra check engine light, rough idling. Turned out to be the mass air flow sensor. Might be worth investigating.

When you say 'investigating further,' what do you mean? Did you try cleaning the sensor first, or replace it? Did you notice any smoke when accelerating?

I didn't try cleaning it. With those symptoms, especially the engine stalling, I took it straight to a workshop. They confirmed the sensor was faulty. Best to get it checked properly.

Okay, good to know. I was hoping for a simple fix, but it sounds like a workshop is inevitable. Thanks for sharing your experience; it's really helpful!