Code Definition

P1163 — Primary Heated Oxygen Sensor (#1) slow response

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

About P1163

P1163 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 P1163 is stored, the module has detected a signal or supply voltage lower than the expected operating range; 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.

P1163 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

On many Honda and Acura engines the primary upstream sensor is a wide band air fuel ratio sensor, often called the LAF or A/F sensor, that reports the actual air fuel ratio to the Engine Control Module (ECM) across a broad range rather than simply switching rich or lean. The ECM relies on its fast, linear response for precise closed loop fuel control. DTC P1163 sets when the ECM determines the primary sensor on bank 1 is responding too slowly to commanded mixture changes, with its reaction time exceeding a calibrated threshold. A slow primary sensor degrades fuel control accuracy, and the driv...

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