A knock sensor is like a small electronic microphone that is usually attached to the engine block and listens for a couple of things that a engine might do. One thing it listens for is pre-ignition or knocking inside the engine usually caused by a few issues including dirty gas, wrong engine timing low octane fuel, wrong air / fuel mixture, and also by the wrong spark plugs. It also listens for engine run on which happens when the vehicle is turned off, but tries to keep running until it stalls. Once a noise is detected, the knock sensor sends a signal to the cars computer which in turn will retard the timing at 2 degree intervals until it corrects the issue. If the knock sensor fails, it can seriously damage the engine, as continuous pre-ignition could cause melting or fractures in the pistons just to name a few.
Comes as a SET of 2
(1) - Knock Sensors X2
Replaces dealer part numbers: 89615-12090
Fit for
2000-2004 Toyota Avalon
1999-2006 Toyota Camry
2000-2002 Toyota Celica
2001-2004 Toyota Highlander
2000-2003 Toyota Sienna
1999-2003 Toyota Solara
2000-2003 Lexus ES300
2005 Lexus GS300
2001-2005 Lexus IS300
1994-2000 Lexus SC300
2000-2003 Lexus RX300
2004-2006 Lexus RX330
