How do you change a knock sensor in a 2004 sienna?

To change the knock sensor in a 2004 Toyota Sienna, first disconnect the negative battery cable to ensure safety. Then, remove the intake manifold to access the sensor, which is located on the engine block. Disconnect the electrical connector from the old sensor, unscrew it, and replace it with the new sensor. Finally, reassemble the manifold, reconnect the battery, and start the engine to check for proper function.