Who judges the Judges?
Any crime committed by a Judge in the exercise of her/his function is judged by her/his hierarchical superior. In the case of judges of regular Courts, it would be the Superior Court of Justice, and in the case of magistrates of the Superior Court of Justice it would be the Supreme Court.
Judges are subject to the same limitations as the rest of the citizens. Judges can commit crimes and are judged therefore, they do not have any privilege in that sense. And in the event that they commit administrative or disciplinary irregularities, the General Council of the Judiciary (CGPJ) also has a disciplinary function with the judges that can be appealed before the contentious administrative channel, as happens with the rest of the officials after the courts.