P2272 — O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2

P2272: O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2 — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • An engine warning may appear even if driving feels normal.
  • Rough running or hesitation may occur if another mixture-control problem is present.

Possible causes

  • The downstream oxygen sensor on bank 2 may be faulty or biased toward a lean indication.
  • An exhaust leak before that sensor or damaged wiring can produce misleading readings.

What to check

  • Confirm P2272 and identify bank 2, oxygen sensor 2, on the specific engine.
  • Inspect the exhaust upstream of the sensor and check its wiring and connector.
  • Compare the downstream sensor live data and related mixture faults with engine specifications before replacing components.

Also written as: P2272-00, P227200 (some scan tools add the fault-type byte, e.g. -00).