I finally got my car back.
The SZL part came but the car continued to give some other errors.

Then the electrician (who is a very dedicated guy) feeling that it had to be something elese, started to follow all the cables to check if something was wrong and then he found the real problem.
At the factory when they screwed a bar, the screw went through a cable, making a ground connection. This was confusing the system.
They were not sure at the end if the SZL was ok or not.