Code Definition

P1167 — Primary Heated Oxygen Sensor (#1) heater circuit, or bank 1 fuel trim too rich during deceleration

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

About P1167

P1167 is a manufacturer-specific powertrain diagnostic trouble code recorded for Acura 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 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

DTC P1167 on Honda and Acura vehicles can represent one of two conditions depending on the application and diagnostic context. It may indicate a malfunction in the heater circuit of the primary bank 1 air fuel ratio sensor, or it may indicate the Engine Control Module (ECM) has detected an abnormally rich mixture, shown as heavily negative fuel trim, during deceleration when fuel cutoff should be active. The primary sensor heater warms the element for accurate readings, while deceleration fuel cutoff normally leans the mixture sharply. Either condition disrupts closed loop fuel control and rai...

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