u/Alternative-Today-65

4.0L V6 (1GR-FE) w/ 75k miles. Hey all. Just recently got this 2019 4Runner Limited used, and i’ve noticed this whining sound coming from the engine bay. This video shows revving in idle (i’ve ruled out transmission issues since noise is rpm based and happens in neutral). No check engine lights, no codes, alternator tested fine. I want some input before I start throwing parts at it. I’m thinking bad pulley bearing?… Thanks 🙏