Canon Text
Canon 406.§1. The diocesan bishop is to appoint a coadjutor bishop and the auxiliary bishop mentioned in can. 403, §2 as vicar general. Moreover, the diocesan bishop is to entrust to him before others those things which by law require a special mandate.

§2. Unless the apostolic letter has provided otherwise and without prejudice to the provision of §1, a diocesan bishop is to appoint his auxiliary or auxiliaries as vicars general or at least as episcopal vicars, dependent only on his authority or that of the coadjutor bishop or auxiliary bishop mentioned in can. 403, §2.
Canon 409.§1. When the episcopal see is vacant, the coadjutor bishop immediately becomes the bishop of the diocese for which he had been appointed provided that he has legitimately taken possession of it.

§2. When the episcopal see is vacant and unless competent authority has established otherwise, an auxiliary bishop preserves all and only those powers and faculties which he possessed as vicar general or episcopal vicar while the see was filled until a new bishop has taken possession of the see. If he has not been designated to the function of diocesan administrator, he is to exercise this same power, conferred by law, under the authority of the diocesan administrator who presides offer the governance of the diocese.

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Canons and cross-references scraped from jgray.org. Catechism paragraphs scraped from vatican.va.
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