REPLACEMENT KNOCK SENSOR : A knock sensor is located on the manifold, cylinder, or engine block. The purpose of the knock sensor is to sense unusual pulsations caused by the engine knock or detonation. Symptoms of a bad knock sensor are check engine light CEL on, loud sounds, bad mileage, poor acceleration and poor engine performance. When you replace the knock sensor please be careful the grime will into the cylinders when you pull the manifold off. COMPATIBLE WITH for , VEHICLES : 2003 2004 2005 2006 2007 Accord; 2002 2003 2004 2005 2006 2007 2008 2009 ; 2002 2003 2004 2005 ;2003 2004 2005 2006 2007 2008 2009 2010 2011 Element; 2007 2008 2009 2010 2011 2012 ; 2002 2003 2004 2005 2006 RSX; 2004 2005 2006 2007 2008 TSX knock sensor. Please check the description to confirm the compatibility purchase. ! REPLACES PART NUMBER# : 30530-PPL-A01, 30530PPLA01, 158-0917, 1580917 knock sensor. colour: black + silver Material: Metal+Plastic Contents: 1 x Knock Sensor Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.