Knock Sensor (Ping Sensor) for 528i (2008-2011), X3 (2007-2012), 128i (2008-2013), 328i (2007-2013), 328i xDrive (2009-2013), 330i (2006), 325i (2006), 530i (2006-2007), 525i (2006-2007), 530xi (2006-2007), 525xi (2006-2007), 325xi (2006), 330xi (2006), Z4 (2006-2011), 328xi (2007-2008), X5 (2007-2010), 528xi (2008), 528i xDrive (2009-2010)