Code Definition

P2273 — Oxygen Sensor Signal Stuck Rich (Bank 2 Sensor 2)

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

About P2273

P2273 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 P2273 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 P2273 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 2, sensor 2, for catalyst efficiency and signal plausibility. DTC P2273 is set when the ECM detects that the bank 2 sensor 2 signal remains fixed in a rich, high voltage range and does not respond to expected changes in exhaust gas composition within the calibrated time and operating range. 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 on bank 2. The main effect is loss of catalyst monitoring and an illuminated check e...

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