The knock sensor is a direct replacement for select 2004-2023 Audi and Volkswagen applications. It detects the vibration frequencies of engine detonation so the engine computer can retard ignition timing.

Walker Products 242-1153 Knock Sensor Features:

• Fits 2004-2005 Audi Allroad Quattro; 2004-2009 Audi S4; 2005-2011 Audi A6 Quattro; 2007-2018 Audi A8 Quattro; 2007-2010 Audi Q7; 2007-2008 Audi RS4; 2008-2023 Audi R8
• Fits 2008-2012 Audi S5; 2013-2015 Audi RS5; 2013-2018 Audi S6, S7, S8; 2014-2018 Audi RS7; 2007-2009 Volkswagen Touareg
• Engine coverage includes 4.0L V8, 4.2L V8, 5.2L V10 applications
• Used in rear right and front left positions, depending on application
• Female oblong electrical connector with 3 blade terminals
• 358 mm (14.1 in.) overall length
• 256 mm (10.1 in.) wiring harness
• Includes wiring harness
• Mounting hardware not included