Ford P0326 OBD-II Trouble Code Definition: P0326 Knock Sensor Signal 1 P0326 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0326 Knock Sensor 1 Circuit Range/Performance What does the code mean? OBD-ii Code P0326 definition: Knock sensors are used to detect engine pre-detonation (engine knock or ping). The knock sensor (KS) is usually a two wire sensor. […]