Code Definition

P1154 — Heated Oxygen Sensor LH front sluggish

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

About P1154

P1154 is a manufacturer-specific powertrain diagnostic trouble code recorded for Honda vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1154 is stored, the module has detected 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.

P1154 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 P1154 is a Honda specific code indicating the front, or upstream, Heated Oxygen Sensor on the left hand bank is responding too slowly to changes in exhaust oxygen content. The Powertrain Control Module (PCM) measures how fast the sensor transitions between rich and lean, and when those transitions become sluggish the sensor can no longer support accurate closed loop fuel control. A sluggish sensor is most often simply aged or contaminated, but a weak heater or an exhaust leak can produce the same lazy response. With this code set the driver may notice slightly higher fuel use, mildly reduc...

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