Enables phytanoyl-CoA dioxygenase activity. Involved in 2-oxobutyrate catabolic process and fatty acid alpha-oxidation. Located in mitochondrion and peroxisome. Biomarker of non-alcoholic fatty liver disease. Human ortholog(s) of this gene implicated in Refsum disease; Zellweger syndrome; orofacial cleft; and peroxisomal disease. Orthologous to human PHYH (phytanoyl-CoA 2-hydroxylase). [provided by Alliance of Genome Resources, Apr 2022]