Enables coproporphyrinogen oxidase activity and identical protein binding activity. Involved in several processes, including protoporphyrinogen IX biosynthetic process; response to lead ion; and response to methylmercury. Located in mitochondrial inner membrane and mitochondrial intermembrane space. Human ortholog(s) of this gene implicated in hereditary coproporphyria and liver disease. Orthologous to human CPOX (coproporphyrinogen oxidase). [provided by Alliance of Genome Resources, Apr 2022]