ROADFAR Knock Sensor Replace 22060-AA070 fit for 1999-2002 for Subaru Forester 2.5L,1999-2002 for Subaru Impreza 2.5L,1999-2001 for Subaru Legacy 2.5L

Knock sensor is designed to detect when the combustion in car is not being properly controlled.A knock sensor uses an internal element that is extremely sensitive to vibration and will detect when the pressure wave from the combustion hits the cylinder wall before it is supposed to.When the sensor detects incorrect noise from internals of the motor it will retard the timing in order to protect the engine.The sensor has been designed to act as if mechanic was listening to the engine and keeping an eye on the things for the driver. Notice : Please find the amazon fitment on the top of the page,enter your vehicle information to check if the item fit your vehicle Fitment: 1999-2002 for Subaru Forester 2.5L,1999-2001 for Subaru Impreza 2.2L,1999-2002 for Subaru Impreza 2.5L,1999-2001 for Subaru Legacy 2.5L,2000-2001 for Subaru Outback 2.5L