Code Definition

P0167 — O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3)

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

About P0167

P0167 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 P0167 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 P0167 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 P0167 fault code is set when the Engine Control Module (ECM) detects a malfunction in the heater circuit of the oxygen sensor located in Bank 2, Sensor 3. This sensor is typically positioned downstream in the exhaust system and may be integrated into vehicles with advanced emission control systems or multiple catalytic converters. Many oxygen sensors come equipped with an integrated heater that helps the sensor reach its operational temperature quickly, essential for accurate readings. A malfunction in this heater circuit could be due to a faulty heater element in the sensor, issues with t...

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