Code PO325, where is the knock sensor located?

Hello, the Knock sensor is located at the top rear of the engine. The wire colors for it are brown and black, it is a 2-wire connector. Just check that the wiring is okay, that no critters have chewed through the wiring harness, but you should be able to find it by the wiring colors.

https://www.2carpros.com/articles/how-a-knock-sensor-works