This is the Knock Sensor Sub Harness found on all Nissan 350Z's and Infiniti G35's equipped with the VQ35DE Engine. When this harness fails you will see a Check Engine Light with the code P0327.
P0327 Codes are caused by either a low output voltage seen by the ECU from the knock sensor pointing to a faulty sensor or a short or open knock sensor circuit.
While most often this code is indicative of a faulty knock sensor sub harness, sometimes the sensors do go bad you can elect to purchase both below and save.
Z1 also sells new OEM Knock Sensors HERE.