Enables arachidonic acid epoxygenase activity and linoleic acid epoxygenase activity. Acts upstream of or within arachidonic acid metabolic process and linoleic acid metabolic process. Predicted to be located in endoplasmic reticulum and membrane. Predicted to be active in cytoplasm and intracellular membrane-bounded organelle. Orthologous to human CYP2C18 (cytochrome P450 family 2 subfamily C member 18). [provided by Alliance of Genome Resources, Apr 2022]