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Home › Acura › 2020 › RDX Base › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTC Diagnostics (P0010 - P0299) › DTC Troubleshooting › DTC P0139 › Overview

DTC P0139: 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.