Replacement
Symptoms of a bad knock sensor are check engine light CEL on, loud sounds, bad fuel mileage, poor acceleration and poor engine performance. Or use an obd2 scanner diagnostic tool to check your car engine, when it throw some codes like P0327, P0325, P0332 and P1037. It means you need to replace the knock sensor for your car.
And the installation may be complicated, you will need some installation tools and refer to related video on YouTube, it will facilitate your installation.