This enzyme metabolizes arachidonic acid predominantly via a NADPH-dependent olefin epoxidation mainly to 14,15-, 11,12-, and 8,9-epoxyeicosatrienoic acids (EET). It also acts as an omega-1-hydroxylase by metabolizing arachidonic acid to 19-hydroxyeicosatetraenoic acid (19-OH-AA). an organic molecule + O2 + reduced [NADPH--hemoprotein reductase] = an alcohol + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Abundantly expressed in heart and liver. Belongs to the cytochrome P450 family.