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Knock Sensor

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

The knock control system adjusts the ignition timing to minimize knock.

Fig 1: Identifying Knock Sensor Terminal, Piezo Element And Diaphragm
G06963730Courtesy of AMERICAN HONDA MOTOR CO., INC.