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The most common cause that will trigger the P1320 code is the ignition coils, one or more ignition coils may have failed. Even tough the coils may be working OK, the resistance for one or more of the coils is greater or smaller than the Engine Control Module (ECM) is expecting. Measuring the resistance with the coil out of the vehicle may not show any failures, usually the coil fails under heavy conditions (hard acceleration) or certain temperatures.
The P1320 code means that there is problem with the "Ignition Coil" or the wire to the ignition coil. For some models without individual ignition coils the Ignition Coil is inside the distributor and the distributor need to be replaced to fix the problem.
Here is the definition. The most common cause is a faulty coil.
P1320 NISSAN Description
The ignition signal from the Engine Control Module (ECM)
is sent to and amplified by the power transistor. The power transistor
turns on and off the ignition coil primary circuit. This on-off
operation induces the proper high voltage in the coil secondary circuit.
Read more: http://engine-codes.com/p1320_nissan.html#ixzz23vOHwQBO
The two codes seem to be related. The P0325 description is knock sensor circuit malfunction and the P1320 is ignition signal - circuit malfunction.
I'll summarize and then give links on more detailed articles I found. Basically the P0325 refers to the knock sensor and associated wiring. The P1320 refers to the ignition coil and wiring. Check the sensor, coil, and associated wiring.
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