Code Definition

P2271 — Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 2)

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Holden

About P2271

P2271 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2271 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2271 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Engine Control Module (ECM) monitors the downstream oxygen sensor on bank 1, sensor 2, to assess catalyst performance and sensor plausibility. DTC P2271 is set when the ECM detects that the bank 1 sensor 2 signal remains consistently in a rich, high voltage range and does not respond to expected exhaust gas changes within the calibrated time and operating window. This points to a sensor or circuit fault, such as a short to voltage or contamination, or a genuinely rich exhaust reaching the downstream sensor. The main effect is loss of catalyst monitoring and an illuminated check engine ligh...

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