The replacement knock sensor is made for select 1999-2009 Volvo applications. It detects the vibration frequencies of engine detonation so the engine computer can retard ignition timing.

Walker Products 242-1173 Knock Sensor Features:

• Fits 1999-2004 Volvo C70; 1999-2000 Volvo S70; 1999-2006 Volvo S80; 1999-2007 Volvo V70; 2001-2009 Volvo S60; 2003-2007 Volvo XC70; 2003-2006 Volvo XC90
• Engine coverage includes 2.3L I5, 2.4L I5, 2.5L I5, 2.8L I6, 2.9L I6 applications
• Female oblong electrical connector with 4 pin terminals
• 584.2 mm (23 in.) overall length
• 485.78 mm (19.1 in.) wiring harness
• Includes wiring harness
• Mounting hardware not included