I have just looked at the warning light in an online manual for the Astra I found on this site.
Unfortunately I can't find the exact symbol for my 1999 Astra 1.6 Sxi 3 Door. But it looks most like the exhaust emission light (and is located between the oil and battery symbol), except mine also has a lighting bolt through it.
I have had the car for years and it has never come on. I have only just passed my MOT just over a week ago and today it came on half way through my journey on the way to work and stayed on until I parked up (hopefully it will not come on again tonight).
Anyway does anyone know what has possibly caused this and what I can do to resolve it?
The only mod I have done is derestricted the airbox a while ago. Is it possible that in the winter months it is now getting an incorrect fuel to air mix?
Also the last service (full dealership service) was around 12 months ago and it is now due again, could it be that?
Many thanks for your help! - I don't want to find myself out in the cold this winter...