Help with 06 Sierra 6.0 liter gas, Getting a P0430 code on my "Ancel AD410" code reader, and No OBD2 scanner reading for short term fuel trim bank2/2 just _ _ _
I tested before Cat and after Cat temps on bank 2 with only a +30 degree f. diff at second O2 sensor.
Where or what do I check to find the problem with the "short term fuel trim bank2/2" and is that why I get the P0430 code?