I recently scanned my car and noticed that in Cell 16 (idle) and whatever cell it goes into when I let me foot off the gas, my LTFT's are -13% and -4%. All other cells are fine, they are not split and are generally -6% to 0%. This has actually been going on now for nearly 3 years and I haven't thought much of it since my car runs fine. I know I don't have an exhaust leak. I'm just wondering if anyone has an idea what could be causing this or if I should even worry about it. Thanks.