Trouble codes P0326, P0325 and P0330

Those are all knock sensor circuit codes. They are also a 2 trip code which means they have to fail the testing twice to turn the light on.
However the sensors share no common wiring and are at opposite ends of the engine (items 13 and 14 in image) so I suspect the issue is in either the connection at the PCM or the PCM itself unless there is harness damage from something like a rodent or sharp area. The pins for both sensors are in one cluster in the connector so if corrosion started in that area it could easily damage both sensor signals.
Testing is easy using that same connector but first I would check the wiring harness that runs across the top of the engine and to the rear of it. Damage there should be visible. Testing the sensors themselves is easy to do as you unplug the wiring connections then use a meter to measure the voltages at the vehicle side connection. With the key on and the engine off both wires from the vehicle side harness should measure about 1.5 volts when using a chassis ground. Then if you turn the key off and use the ohms part of the meter you should see no connection from either terminal to a ground. If you see no voltage on either wire with the key on that wire is open, if you have a grounded wire with the key off the wire is shorted. The third image applies for both the voltage and resistance tests for both sensors. They are the same parts just in different spots.
To test at the PCM connector you would disconnect the battery then remove connector 1 and find the pins for the sensors, those are 53 and 54 for sensor 2 and 55 and 56 for sensor one. Using an ohm meter to test between them you should have less than an ohm between the pins of each set with the sensors plugged in, with the sensors unplugged there should be no connection between the pins to either voltage or ground.
Some scan tools could also test this by showing the voltage from the sensors if you tap the engine block with something like a hammer or steel rod.

It's possible that the sensors have failed as well, but for both to fail at the same time is somewhat suspect which is why I would start by checking the wiring and connections.