A failed knock sensor will register a trouble code and illuminate the Check Engine lamp (CEL), although some engines will require multiple failure cycles before storing a code. Misfire. Vibration, especially at highway speed. Thumping or knocking noise from the engine. Poor fuel economy and acceleration.. This calls for the following steps. Step One: Locate and remove the suspected bad knock sensor. Step Two: Set your multimeter to measure resistance. Step Three: Connect the red lead to the knock sensor connection port. Then connect the black lead to the knock sensor housing on the other end of the knock sensor.

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**Want to own the tools I use ?? Click on the amazon link below to get my top 5 Tools I use**Automotive Test Light- https://amzn.to/3z1PdxaFlexible Backprobe.. Manufacturers have designed the engine knock sensor to detect these vibrations. It is like a stethoscope that is constantly listening for knock. The ECU receives the signal and adjusts ignition timing based on that. A byproduct of this adjustment is improved fuel economy and increased power lower in the rev range.