How do you change knock sensor on 2005 Chevy Trailblazer?

To change the knock sensor on a 2005 Chevy Trailblazer, first disconnect the battery to ensure safety. Then, remove the intake manifold or any components obstructing access to the knock sensor, which is typically located on the engine block. Unscrew the old sensor, replace it with a new one, and reconnect the wiring harness. Finally, reassemble any parts you removed and reconnect the battery.