The primary function of CYP2J2 is the metabolism of fatty acids into epoxyeicosatrienoic acids (EETs). EETs are signaling molecules that have various physiological effects, including vasodilation, anti-inflammatory properties, and the regulation of blood pressure. In the liver, CYP2J2 contributes to the oxidative metabolism of various xenobiotics and endogenous compounds, making it crucial for detoxification processes.