Hi,how are you?The o2 sensors and the mass air flow sensor will make this code get stored in the system.The o2 sensor that you have not replaced is most likely what is making this code store.But also i would suggest checking out the mass air flow sensor.
The MAF is measured by detection of heat transfer from a hot film probe because the change of the mass air flow rate causes change in the amount of heat being transferred from the hot film probe surface to the air flow. The air flow sensor generates a pulse so it repeatedly opens and closes between the voltages supplied from the PCM. This results in a change of the temperature of the hot film probe and in the change of resistance.
This sensor is located in the air intake plenum assembly. This sensor is combined with the IAT sensor.