325 means you have a bad knock sensor or a possible short somewhere in the knock sensor circuit.
660 is related to the VICS solenoid valve, and will have nothing to do with the knock sensor.
my suggestion, get a new knock sensor and a new VICS solenoid valve, install them, reset the ECU, and monitor to check if they come back. if the code come back, you'll have to check through your wiring.