I have been running Speed Engineering LT headers with a Blackbear tune for a couple months and a couple days ago the CEL came on. Checked the codes and it's showing issues with the position 1 O2 sensors on both bank 1 and bank 2. I think I'm at around 107k miles and I bought it used at around...
I've been researching this for some time with no successful fixes found. I have an Aries Bull bar mounted on a 2017 Yukon XL. It triggers the two central bumper sensors into alert mode and I get the graphic in the DIC as well as seats buzzing constantly. I've asked the dealership if they can...
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