A bad knock sensor may also not let the engine accelerate properly while driving on the highway, and cause the vehicle to lose fuel mileage. This is true for the knock sensor as well. If the knock sensor detects an abnormality, the computer will let you know with the Check Engine Light.
Bad Knock Sensor Symptoms #1 - Strange Feeling When Accelerating. One indicator that your knock sensor has gone bad is that your car will feel strange when you are accelerating, or when you load it with more gear than usual. To test this, get the car up to operating temperature. Now, when you next press on the gas, try paying attention to how ...