DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0326 will set if the PCM cannot reduce spark knock (as seen by the knock sensor) by retarding timing. The knock sensor activity is probably due to engine noise and not spark knock.