I have an 08 Accord Coupe 3.5l V6. Originally when I bout it it had some codes cleared that eventually popped back up (P0155 - B2S1, P0135 - B1S1, P0420 - CAT).. It wasn't affecting the power or rough idle at all, I looked into it and the wires seemed fine so I left it alone. Also if I unplug the battery, the codes are gone until the 2nd start up..which I was doing untill I addressed my parasitic drain..

Finally I got tired of the light staring at me, so I decided to dig further and address it. Scanned again, now it's showing P0161 - B2S2, P0141 - B1S2, P0155 - B2S1, P0135 - B1S1(all heater circuits) & P0498 - EVAP purge valve control circuit low.. I checked my fuses and even swapped them to be sure, all good.. the wiring looks fine. (Both sensor 1's are newer and probably replaced recently)

I'm wondering if it is wiring? Or could the EVAP be causing all this.. I find it hard to believe that all 4 of my O2 sensors are bad..

 

I would look for a global issue and if the 02 sensors are aftermarket after addressing the EVAP purge code. When I did the used cars for a dealership you run into a lot of cars that have issues others couldn't sort out. What you quickly find out is to address known problems if they are even close as this will correct the problem or provide a starting point.