Code Definition

P0144 — O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)

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

About P0144

P0144 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0144 is stored, the module has detected a signal or supply voltage higher than the expected operating range; 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 P0144 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 P0144 fault code is triggered when the Engine Control Module (ECM) detects a higher than expected voltage output from the oxygen sensor in Bank 1, Sensor 3. This sensor is usually located downstream in the exhaust system and is often used in vehicles with advanced emissions systems or multiple catalytic converters. A high voltage signal from this sensor typically indicates a rich air-fuel mixture, where there is an excess of fuel relative to the amount of oxygen in the exhaust. Possible causes for this high voltage output include a malfunctioning oxygen sensor, wiring or connector issues, ...

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