§1. The cardinals who have been assigned title to a suburbicarian church or a church in Rome are to promote the good of these dioceses or churches by counsel and patronage after they have taken possession of them. Nevertheless, they possess no power of governance over them nor are they to intervene in any way in those matters which pertain to the administration of their goods, their discipline, or the service of the churches.
§2. In those matters which pertain to their own person, cardinals living outside of Rome and outside their own diocese are exempt from the power of governance of the bishop of the diocese in which they are residing.
Source: Code of Canon Law (Vatican.va)