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:
1990-1994 Nissan D21
1995-2004 Nissan Pickup
1987-2000 Nissan Pathfinder
1993-1998 Nissan Quest
2000-2004 Nissan Xterra
1991-2001 Nissan Sentra
1995-1998 Nissan 200SX
1991-1998 Nissan 240SX
1990-1996 Nissan 300ZX
1993-2001 Nissan Altima
1990-2001 Infiniti Q45
1991-2002 Infiniti G20
1996-2001 Infiniti I30
1993-1997 Infiniti J30
1997-2000 Infiniti QX4
1993-1998 Mercury Villager

Package Including
one knock sensor and harness