Hi my wife has a 307 diesel with above fault and the engine management light on. The car is a 2005 110bhp version. Just to add that when the engine is running and revved but not moving without the clutch engaged there is a distinct smell of fumes from the engine bay/through the heating vents, however both the garage and I cannot see where from. Also just to add there is very little back pressure from the exhaust on tick over, and the garage said they could only smell clutch related smells and reset the fault only for it to come back on 2 miles down the road. So can anyone explain how the exhaust system works with regards to the anti pollution fault, so that I can try and sort this out myself.