Red light on Opel Zafira dashboard

Hello everyone, I am new in the forum and I premiered with a question.
I have a Gasoline Zafira 1.6 of the year 2003. I have been lit a red light in the dashboard with a cross key. I took him to Opel, they changed me very well that but the problem persists. If they put self -diagnosis, no failure neither mechanical or electric appears.
They tell me that changing the unit of the switchboard disappears the problem but costs € 1200.
Does anyone know what failure can be?
If self -diagnosis does not give any failure is dangerous to remain on that light?
Thank you very much to everyone.

Hello, well, is a cross key and behind a car form? If so, it is the starter key code that I know has nothing to do with the switchboard and injection. There are vehicles that contain a chip or something in the key of the medium security car. greetings

That light is the reader or avizor of the key code reader, it is not dangerous but be careful, because at some point you may not read the code anymore and will not start that code that code should leave in a Scaner depending on the usefulness of the same, but do not worry for now not open problem, the Fiat leaves it on for the centime After using another key and not the original car but the copy of this, this often happens, it is no major problem.