The knock sensor is a direct replacement for select 2005-2021 Audi, Porsche and Volkswagen applications. It detects the vibration frequencies of engine detonation so the engine computer can retard ignition timing.

Walker Products 242-1102 Knock Sensor Features:

• Fits 2005-2009 Audi A4 Quattro; 2005-2015 Audi A6 Quattro; 2006-2007 Audi A4; 2006-2011 Audi A6; 2008-2010 Audi A5 Quattro; 2009-2017 Audi Q5; 2010-2021 Audi R8
• Fits 2010-2016 Audi S4, S5; 2011-2015 Audi Q7, Volkswagen Touareg; 2012-2015 Audi A7 Quattro; 2013-2014 Audi A8 Quattro; 2014-2017 Audi SQ5; 2018 Porsche Cayenne
• Engine coverage includes 3.0L V6, 3.2L V6, 5.2L V10 applications
• Female oblong electrical connector with 3 blade terminals
• 387.35 mm (15.3 in.) wiring harness
• Includes wiring harness
• Mounting hardware not included