Also exhibits azoreductase activity. Catalyzes the reductive cleavage of the azo bond in aromatic azo compounds to the corresponding amines. Can reduce ethyl red, methyl red and p-methyl red, but is not able to convert sulfonated azo dyes. The stoichiometry implies that 2 cycles of the ping-pong mechanism are required for the cleavage of the azo bond. Can also act as a nitroreductase and is able to reduce nitro compounds such as 7-nitrocoumarin-3-carboxylic acid (7NCCA)