Code Definition

P0145 — O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)

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

About P0145

P0145 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 P0145 is stored, the module has detected a signal or supply voltage lower 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 P0145 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 P0145 fault code is set when the Engine Control Module (ECM) detects that the oxygen sensor in Bank 1, Sensor 3, has a slower response time than expected. This sensor is generally located downstream in the exhaust system and is often used in vehicles with complex emission control systems or multiple catalytic converters. A slow response in the oxygen sensor refers to its delayed adjustment in voltage output in response to changes in the oxygen content of the exhaust gas. This can impact the ECM's ability to effectively monitor and control the exhaust gas composition, particularly for emiss...

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