My engine management light on my 2002 Vectra 2.0dti estate has just started coming on when I stop and dip the clutch, whilst at traffic lights or junction. The light soon goes off again once I'm up to 2nd or 3rd gear again. It has never come on whilst the car is in full motion, which, thanks to the internet and forums like this, I am now thinking it is the 'idle air contol valve', as mine only comes on whilst in 'idle'.
I am going to have a go at removing it and cleaning it tomorrow (when it's stopped raining!!!)
I'll keep you posted. Hope it solves it because I have some long trips to do next week and wouldn't want it to cut out or break down on me.
ScorpsFan, July 2009