Home/Shop by Part/Engine & Engine Management/Engine Sensors & Electrical/Knock Sensor Narrow The Number Of Models Shown By Telling Us The Year Filter Models by Year 1999 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 Choose your BMW Model # 1999 540i Knock Sensor 1999 740i Knock Sensor 1999 740iL Knock Sensor