U HAVE ALREADY DONE THE RESET, IF THAT DOESN'T RESET IT THEN THE SYSTEM HAS A DEFECTIVE PART. SOUNDS LIKE THE DOOR LOCK SENOR IS DEFECTIVE ON THE DOOR LATCH INISDE THE DOOR.
properly fitted by an accredited exhaust shop it will
nissan do not make cat converter but use manufacturer muffler that the exhaust shop has access to