Code Definition

P1169 — Primary Heated Oxygen Sensor (#1) high input, or bank 2 fuel trim too rich during deceleration

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

About P1169

P1169 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 P1169 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.

P1169 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 P1169 on Honda and Acura vehicles can represent one of two conditions. It may indicate the primary bank 1 air fuel ratio sensor signal is staying abnormally high, typically above about 0.9V on a conventional sensor, which reflects a persistently rich exhaust, or it may indicate the Engine Control Module (ECM) has detected bank 2 fuel trim remaining too rich during deceleration when fuel cutoff should occur. A sustained high signal means a genuine rich mixture or a signal circuit shorted to voltage, while the deceleration condition points to extra fuel reaching the engine on overrun. Either...

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