I have a service emissions coming across the DIC and my service engine light stays on as well. I have had a scanner put on my car and the code coming up is P0325 which indicates Knock sensor circuit. Does any one know if this indicates the sensor is bad or is it the wiring? Also is the code P0325 the reason why the service emissions light is coming on? I have a Chilton's repair manual and it doesn't tell much. I can't even locate the sensor in the book or in the car, all I know is that it is in the center, upper enigine area, mounted in the rear of the intake manifold. Has anyone replaced a knock sensor or can someone please help and if possible send pics? Thanks....