Involved in iodate respiration (PubMed:32190953). Probably reduces the H(2)O(2) produced by IdrA/IdrB to H(2)O, using a reduced cytochrome c as the electron donor (PubMed:32190953). 2 Fe(II)-[cytochrome c] + 2 H(+) + H2O2 = 2 Fe(III)-[cytochrome c] + 2 H2O Binds 2 heme c groups. The iodate reductase (Idr) complex is composed of a molybdopterin-dependent iodate reductase (IdrA and IdrB subunits) and two associated peroxidases (IdrP1 and IdrP2). Abundantly expressed under iodate-respiring conditions.