What should I replace first when my codes are PO732,PO733,PO734

Your approach to repairing the trouble is the first thing!.... Replace NOTHING until the actual problem(s) have been found.. Use the codes as only a guide as to where to start the hands-on diagnosis and testing!

what do I do to repair the PO733 code first and second and so on the Saturn is a 2000 sc2 vin# 1G8ZY14771Z269228 also code #PO410