Hey guys what does the Knock Sensor do?? and how do I change it I think I have never changed it since I have had my car.

 

it is located under the manifold. if you have small hands, you can get to it if not you can use a long extension with a swivel and install it. The bit*h is getting to it and the harness. My bro has done one in 15 mins but he has small hands and he got all scraped up

 

buy mine for $100 shipped NIB , pics on homepage

 

It detects knock caused by detonation and inturn retards timing.

 

All I know is that you can replace it with a resistor. They replaced the knock sensor on the 2.5l altima se-r engine with a 500k ohm reistor. The knock sensors on those cars are insanely sensitive...