I was elated when I found this thread last night as I have exactly the same symptoms and was looking forward to the easy fix.
However, each of the wires were firmly attached to the sensor so I took the engine cover off to investigate further, and found that I had two bolts missing from the air inlet manifold (i think that's what it is, big black pipe that goes front to back of the bay and attaches above the
!?) and the one that remained was loose! It was completely free and therefore had no chance of creating a seal.
Can I get these replacement bolts from anywhere or do I have to get them from Renault? The one that remains has a hole in the end of it and it looks as if there is something inside. Please can someone advise? As you can probably tell, I'm no expert. Many thanks.