Hi,
I'm no expert but I do have a Vectra B(01) that had a similar fault to the one you described. Light would come on at random and sometimes stay on for ages. I was told by the main dealer that I needed a new throttle body. Kerching!
I got the guy who does my cam belt changes to look at it. Couldn't believe it! He took the cover off to expose the throttle body and you could see the black and yellow carbon deposits around the inside of the throttle, just under that disc thing that flips open.
He didn't have any carbon cleaner so he (literally) cleaned around the 'disc' with WD40 and a rag.
That was four months ago and I aint seen the light on since.
Just something you might want to look at?
Good luck.
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