I have a 2006 Denali with the 6.0 LQ9. Roughly 245k on the clock, but it has been maintained and taken care of very very well. These two codes have persisted, but the truck doesn't respond like its running lean. throttle response is normal, power is normal, idle is normal, fuel mileage doesn't seem to be effected. There's also many new parts on it such as the fuel pump, O2 sensors, Throttle body and more. I had this issue on my camry (given it was a four cylinder so only one bank) and it seemed to be a unique reason for the code. I wanted to ask if anyone has had this issue and what their fix was before i dive into this.