SunshinePerformance

Hey got a couple of questions... first off I just replaced my stock heads with a set of patriots and my O2's r all screwed up. Here it goes my Bank 1 sensor 1 reads 445-457mvs, Bank 2 sensor 1 reads 0-120 and jumps up to 640-820. The code that im pulling is low volts on bank 2 sensor 1 and that is it. My Lt & St for both banks max out once PCM goes into closed loop, know the car is just running in open loop and im out of answers please help. Think electrical problem but all wires have good OHMS and volt, but air/fuel gauge has faint lean signal, and radio has an RPM noise pick up. All started after heads were installed. Other thought is a mechanical problem ie: bad head gasket, fouled plugs, bad O2s, bad ground, or open wire but dont know.