Is it safe to drive astra when engine warning light is on?

Yes, as long as there is no noticeable change in engine noises or the way it drives. Your best bet is to take it to a certified shop to have it checked out, or to an auto parts store (ex. Autozone) where they can check it with an OBDI or OBDII code reader and be able to give you some direction (usually at no cost to you)