There are two knock sensors, and they are installed into the block (left and right side) under the intake manifold. The intake manifold must be removed to replace them. They are not identical, and must be installed in the correct position (they are tagged) so that the PCM knows which is which.
SOURCE: Where is the location of the knock sensor for a 2005 HD 2500 6.0
HAS TWO KNOCK SENSORS they are both under intake in valley of engine. remove intake and will see two black grommets they are under those best to replace both at same time
SOURCE: unable to locate the fuel filter on my 2005 dodge magnum 2.7 liter
It's located in your fuel tank.
cheers.
SOURCE: knock sensor dont work for 2005 dodge durango
this problem is very seldom the knock sensor, it can be the harness connector at the sensor or the engine has excessive knock which will set a code, u did not mention the particular code so hard to say, the location of the knock sensor is the lower section of the engine block, it is screwed into what would normally be a block drain plug, if u replace it u need to torque it to whatever the factory spec is or it can cause it throw another code..
SOURCE: knock sensor location
The knock Sensors are located under the Intake Manifold at the top of your engine. The top will have to be taken off along with the intake manifold. Knock Sensors in past silverados used to have a problem with leaking water that corroded the sensors from washing the engine. Most times when you go to replace the knock sensor you will have to replace both along with the wiring harness that includes the the gaskets the knock sensors are surrounded by. After that you have to check the resistance to make sure you dont have any problems and then reinstall all parts along with a new intake manifold gasket. A good mechanic can do this for you in a day and charge you around $400. If you try to go to some place like a chevy dealer you will pay over $800. This is from experience of just replacing mine 2 weeks ago.
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