Code Definition

P1167 — Heated Oxygen Sensor 2 bank 2 voltage high

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Infiniti

About P1167

P1167 is a manufacturer-specific powertrain diagnostic trouble code recorded for Infiniti vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1167 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.

P1167 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The heated oxygen sensor 2 on bank 2 is the rear, post catalyst sensor on the bank that does not contain cylinder number one, used by the Engine Control Module (ECM) chiefly to monitor catalytic converter efficiency. DTC P1167 sets when the ECM detects that this rear sensor signal is biased high, holding toward the rich end of its range rather than the steady mid range a working catalyst produces. The cause may be a genuinely rich exhaust, a contaminated rear sensor, a signal wire shorted to a voltage source, or sensor fouling from oil or coolant. The malfunction indicator lamp will be illumin...

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