Code Definition

P2195 — Oxygen Sensor Bank 1 Stuck Lean

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

About P2195

P2195 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 P2195 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 P2195 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 upstream oxygen sensor signal for bank 1 during closed loop operation, expecting it to switch rapidly between rich and lean. DTC P2195 is set when the bank 1 sensor signal stays fixed at a lean indication and does not respond to commanded mixture changes within the calibrated time and operating range. This means either the sensor is not switching normally or the exhaust mixture is genuinely lean beyond the correction the ECM can apply. The driver may notice poor fuel economy, hesitation, or a check engine light, and the scan tool typically shows a h...

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