The oxygen sensor was changed at 165000.
The fuel pump was changed at 180000.
A problem never fixed was the (orange) engine light coming up from time to time... I wonder if someone can help me?
You don't have to fix it. It's normal in OPEL. I remember my father had Opel Kadet, it was the same. And my Father has 93 Opel Vectra, and it's the same as well. And I have 1991 Opel Calibra and guess what!! It's the same like yours and my fathers.. no big deal. Just ignore it.