Does anyone with experience dealing with the 02 sensors have an idea of why I could keep throwing the P0031 DTC. I originally thought it was ECUFlash related (tuning related), but have spent lots of weeks working on this.

My original 02 sensor tested out properly, but anyway I ended up replacing the 02 sensor, and the mini battery.

I have a thread in the ECUFlash forum, Here, but I was wondering if maybe I am chasing something that could be related to something completely different, and I am out of ideas. Any thoughts/ideas/guesses appreciated!!!!

M