zachary A makoff
Newbie
my 98 k1500 with a 5.7 came factory with true duals and I installed the jegs cat delete y pipe and new upstream o2 sensors and 1 downstream.I didn't do the 2 downstream as it was after the pipe and stuck. After I finish I am now having a check engine light with the codes P0134 and P0154 which are no activity for the upstream O2 sensors. I hooked up my scan tool and checked the voltages and they are staying at 0.45 the ones that I replaced. the one that I left is fluctuating from .03-07. Any ideas?