I have this code throwing since I installed a SOLO cat and Trifecta Tune on my 2009 Solstice 2.0 turbo .
I have heard that adding an O2 extender will help but believe that there is more to it than that .
I have their reflash software and can turn it off but then will not pass inspection due to 2 not ready's .
The other not ready is the EVAP system and am tired of trying to get it to the ready .
Any help or insight would be appreciated .