There may be exhaust leaks near the Oxygen Sensor.
Perhaps the O2 Sensor is contaminated or faulty.
The Oxygen Sensor circuit wiring may be faulty.
There may be incorrect fuel pressure.
A fuel injector could be faulty.
Possible solutions of the DTC code P2272 Generic
Steps to troubleshoot the P2272 OBDII diagnostic code:
Check the wires and connectors that relate to the Oxygen (O2) Sensor and its circuitry. Fix or replace any of these components that have corrosion, rubbing against other components, or burn spots.
Check that the harness connectors have the resistance level recommended by the manufacturer. Make any necessary corrections.
Check for exhaust leaks. Repair if necessary.
Use a scanner to monitor the O2 Sensor readings observed by the PCM. Remember that the Oxygen Sensor voltage changes between 0 and 1V. Rev the engine and verify that the sensor voltage changes. If you rev the engine and the sensor voltage does not change, replace the sensor.