The O2 sensor not only checks the right operation of the catalytic converter (TWC) but also measures the amount of oxygen in the exhaust. This sensor has a voltage that varies between 0 and 1.
The DTC P2272 OBDII is related to Oxygen (O2) sensor number 2 on bank 2. It means that the signal from this sensor is stuck in lean. In other words, there is an excessive amount of air in the exhaust.