A knock sensor is like a small equipment 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.

Fit for
2005-2007 for Buick Allure 3.6L
2008 for Buick Enclave 3.6L
2005-2008 for Buick LaCrosse 3.6L
2004-2006 for Buick Rendezvous 3.6L
2005-2007 for Cadillac CTS 2.8L
2004-2008 for Cadillac CTS 3.6L
2004-2008 for Cadillac SRX 3.6L
2005-2008 for Cadillac STS 3.6L
2008 for Chevrolet Captiva Sport 3.6L
2008 for Chevrolet Equinox 3.6L
2008 for Chevrolet for Malibu 3.6L
2007-2008 for GMC Acadia 3.6L
2007-2008 for Pontiac G6 3.6L
2008-2009 for Pontiac G8 3.6L
2008 for Pontiac Torrent 3.6L
2006-2009 for Saab 44077 2.8L
2007-2008 for Saturn Aura 3.6L
2007-2008 for Saturn Outlook 3.6L
2008 for Saturn Vue 3.6L
2007-2008 for Suzuki XL-7 3.6L