P2272 - O2 SENSOR SIGNAL BIASED / STUCK LEAN BANK 2 SENSOR 2

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.

• Check Engine light ON.
• The motor does not work properly.

Causes of the P2272 OBD2 fault code:

• 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.

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.