So you are saying that the problem is not an O2 sensor. I just got one of the code pullers and pulled codes myself and this is what came up

P1153 Air/Fuel Ratio Sensor Circuit Response Malfunction (Bank 2 Sensor 1)
P1155 Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

So with these codes what do you think the problem is? I never got the 1153 until now do you know which sensor that is? Is that the one on top of manifold?