July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Knock Sensor (1NZ-FXE): Components
WARNING: This page is about a different car, the 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Locating Knock Sensor (1NZ-FXE) Components (1 Of 2)