How do you change a knock sensor on a 1998 Infiniti Q45?

To change the knock sensor on a 1998 Infiniti Q45, first disconnect the negative battery terminal to ensure safety. Locate the knock sensor, which is typically positioned on the engine block beneath the intake manifold. Remove the necessary components to access the sensor, including the intake manifold if needed, then disconnect the electrical connector and unscrew the old sensor. Install the new sensor, reattach the connector, and reassemble any components you removed before reconnecting the battery.