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09/07/2022 4:16 pm
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2013 gmc sierra, 4wd, 5.3l automatic withe 140000mi. Dtc code po15B. I have check for vaccum leaks, and o2 sensors seem to be putting out the right volts, and the o2 sensor seem to be correct for catalytic converter readings as well. Not sure if I need to look at injectors or hunt better for a vaccum leaks, I'm not sure what to do.
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