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Home › Acura › 2025 › Integra Base › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnostics (P0121 - P0300) › Troubleshooting › DTC P0139 (1.5L Engine) › Overview

DTC P0139 (1.5L Engine): Overview

If the secondary HO2S (Sensor 2) output voltage does not change during stoichiometric feedback controlled, the PCM determines an abnormality and stores the DTC.