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P0320 is for loss or PIP or crankshaft position sensor. Check the Sensor on the front of the engine by the crankshaft pulley. Make sure it is plugged in securely and also make sure there is no oil or crud built up in the connector and the harness. Clean everything up and clear the codes and then retest.. If concern still present, change the sensor.
I'm sorry code was 354 not 320.
P0354 is for the coil driver failure for cylinder #4 which is internal in the PCM.
Make sure you have power to the connector for the #4 coil while the key is turned to on and check for power on the
WHITE/VIOLET striped wire and a pulsed ground on the WHITE/PINK striped wire while the engine is running.
If it is the coil driver #4 in the PCM can just this be replaced or does the entire PCM need to be replaced?
Does it need to be reprogrammed after? and is Ford dealer only place to get this done?