Yup. I don't understand that AT ALL. But then, I don't understand why your scan tool is showing three short term fuel trims, with two of 'em being "0", either.
Any chance someone put a defeat device on the O2 sensor harness from the vehicle, to mimic O2 sensors? Or are the vehicle harnesses for the sensors open with nothing plugged into them?
Any chance someone put a defeat device on the O2 sensor harness from the vehicle, to mimic O2 sensors? Or are the vehicle harnesses for the sensors open with nothing plugged into them?