LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Acura
>>
2019
>>
RDX Technology, FWD
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Control System - DTC Diagnostics (P0010 - P0299)
>>
DTC Troubleshooting
>>
DTC P0139
>>
Overview
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
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.