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Ok so I have a 2002 4.3l V6 2wd 1500 and a while back my SES light came on and I finally checked it and had quite a few codes in there... P0134 P0135 P0141 P0154 P0155 P0157 (pending) So after looking up the codes they are all related to the O2 sensors, so I replaced both upstream and the...