Everything was fine, then I swapped stock midpipe for a UPR o/r x-pipe with MIL eliminators from LMR. Stock 02 sensors (37k miles). The shop that did the swap didn't appear to be the most knowledgeable and took about 4 hours to do the swap. Maybe 20-30 miles later the CEL came on and threw the P0170 bank 1 code and some other one, I forgot. I figured the MIL eliminators were put on incorrectly and was planning on swapping the X pipe for an H pipe so ignored it. I later swapped to a BBK o/r H pipe with brand new NTK O2 sensors just in case. CEL came on about 10 miles later this time. Got my livewire tuner with a bama tune to account for the h-pipe and after I uploaded the tune, all was good. Maybe for about 50 miles. Now the CEL is back on with only the P0170 code, bank 1 too lean. Nothing else was touched...any advice on where to start? Bad MIL eliminators?
