Code Definition

P0141 — O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

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

About P0141

P0141 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 P0141 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 P0141 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 P0141 fault code is set when the Engine Control Module (ECM) detects a malfunction in the heater circuit of the oxygen sensor located in Bank 1, Sensor 2. This sensor is usually positioned downstream in the exhaust system, after the catalytic converter. Many modern oxygen sensors have an integrated heater that helps the sensor reach its operating temperature more quickly, which is vital for accurate readings. A malfunction in this heater circuit can be due to a faulty heater element in the sensor, issues with the wiring or connectors, or problems in the control circuit within the ECM. The ...

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