Service Bulletin
June 25, 2025

25-040
Version 1

MIL Comes On With DTC P0139
APPLIES TO
Year

Model

Trim Level

VIN Range

2017

Accord Hybrid

ALL

ALL

SYMPTOM
The MIL comes on with DTC P0139 (secondary heated oxygen sensor slow response).
POSSIBLE CAUSE
The ECM/PCM misinterprets the secondary heated oxygen sensor output and sets DTC P0139.
CORRECTIVE ACTION
Update the PGM-FI software using i-HDS, then clear ALL-DTC’s.
WARRANTY CLAIM INFORMATION
Operation
Number

Description

Flat Rate
Time

Defect
Code

Symptom
Code

Template ID

Failed Part
Number

1255D8

Update the PGM-FI Software
(includes DTC clear)

0.2hr

03265

03203

A25040A

37805-5K1-A75

TOOL INFORMATION
Part Name

Part Number

Quantity

iHDS and Honda approved VCI

BSEHAC001

1

Midtronics DCA-8000 Dynamic Diagnostic Charging
system, or Associated Equipment Corporation
ESS6100 100A Smart Charger

MTRDCA8000PA

1

CUSTOMER INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment,
and training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not
assume this bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact
an authorized Honda automobile dealer.

© 2025 American Honda Motor Co., Inc. – All Rights Reserved

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SOFTWARE INFORMATION
i-HDS Software
• Version 1.010.011 or later
HDS Software
• Version 3.105.036 or later
Honda ECU Reprogramming
• Version 4.7.0.0 or later
Programming ID
• 37805-5K1-A77 or later
SOFTWARE UPDATE PROCEDURE
NOTICE:
•
•

Do not use the MongoosePRO VCI for this service bulletin as it may damage the ECU and is not an American Hondaapproved device.
To prevent control unit damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power
windows, door locks, etc.) during the update.

NOTE:
•
•
•
•

•
•
•
•
•

Update only the systems and software listed in this service bulletin.
Unnecessary or incorrect repairs resulting from a failure to update the diagnostic and reprogramming software are not
covered under warranty
Make sure the 12-volt battery is fully charged before starting an update.
Connect the Midtronics GR8-110P AST in Power Supply Mode, or the Midtronics DCA8-8000 Dynamic Diagnostic
Charging System in Reflash Mode, or the Associated Equipment Corporation ESS 6100 100A Smart Charger in Power
Supply Mode | DIAG+, directly to the vehicle’s12-volt battery. Leave it connected during the entire procedure to maintain
a steady voltage.
Do not use a lithium-ion jump pack to supply power due to the pulses of high amperage that do not provide consistent
power to the battery.
Control module failure caused by the improper completion of a software update (early key cycle, low battery voltage,
disconnected DLC cable, etc.) is not covered by warranty.
If an error occurs during the update or the i-HDS freezes, reboot the i-HDS and start over. Do not disconnect the
battery or turn the ignition to OFF.
Warranty reimbursement for technician labor is not allowed for routine checking/installation of any available software
update.
This update will not require entering a service bulletin number.

1. Update the PGM-FI software using the ECU Reprogramming Application with the DST-i. Refer to service bulletin 22-100,
Updating Control Units/Modules with the ECU Reprogramming Application.
2. Do an ALL-DTC CHECK to clear any codes that may have set during the update

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