1998 Nissan Maxima engine code

P1320 Ignition Signal Ignition/Distributor Engine Speed Input Circuit Malfunction

Check wiring to your crankshaft position sensor. Make sure no frayed wires. Be prepared to have to replace the sensor, if necessary.

P0325 Knock Sensor 1 Circuit Malfunction (Bank I or Single Sensor)

Again, check wiring to the knock sensor. And you may have to replace the sensor, if necessary.