Engine knock
Knock, or pinging, is combustion that starts too early and the knock sensor is there to hear it.
P0325 is a knock-sensor circuit fault and P0327 is a low input. A noisy sensor circuit is not the same as a mechanical knock from low-octane fuel, carbon, or timing.
If you hear pinging under load, save the code and the conditions. The DTC page separates a bad sensor circuit from combustion knock.
A trouble code marks a condition to test. It does not by itself prove which part to replace.