AutoCodes – Honda – P0139 2020 Honda CR-V

P0139 2020 Honda CR-V Code - Secondary Heated Oxygen Sensor 2 Slow Response

Quick Answer

The Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) detects the oxygen content in the exhaust gas downstream of the three-way catalytic converter (TWC) during stoichiometric air/fuel ratio feedback control. Common causes include Faulty Secondary Heated Oxygen Sensor 2, Secondary Heated Oxygen Sensor 2 harness is open or shorted, Secondary Heated Oxygen Sensor 2 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0139 2020 Honda CR-V indicates Secondary Heated Oxygen Sensor 2 Slow Response.
Common causes: Common causes include Faulty Secondary Heated Oxygen Sensor 2, Secondary Heated Oxygen Sensor 2 harness is open or shorted, Secondary Heated Oxygen Sensor 2 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 253

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 14, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0139 2020 Honda CR-V Description

The Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) detects the oxygen content in the exhaust gas downstream of the three-way catalytic converter (TWC) during stoichiometric air/fuel ratio feedback control. The Powertrain Control Module (PCM) controls the air/fuel ratio with the Air/Fuel Ratio (A/F) Sensor (Sensor 1) output voltage to optimize the TWC's efficiency. When the Secondary HO2S (Sensor 2) does not change during lean air/fuel ratio when the throttle is closed, after the full current is applied to the Secondary HO2S (Sensor 2) heater, and output remains within the specified range continuously, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0139 2020 Honda CR-V - Secondary Heated Oxygen Sensor 2 Slow Response - AutoCodes.com — P0139 2020 Honda CR-V Code - Secondary Heated Oxygen Sensor 2 Slow Response

What does this mean?

What are the Possible Causes of the DTC P0139 2020 Honda CR-V?

Faulty Secondary Heated Oxygen Sensor 2
Secondary Heated Oxygen Sensor 2 harness is open or shorted
Secondary Heated Oxygen Sensor 2 circuit poor electrical connection
Exhaust system failure (exhaust gas leak)

How to Fix the DTC P0139 2020 Honda CR-V?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0139 2020 Honda CR-V code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0139 2020 Honda CR-V code?

Need more information on how to fix the P0139 2020 Honda CR-V code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0139 2020 Honda CR-V code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0139 2020 Honda CR-V Code

What does the OBDII code P0139 indicate for a 2020 Honda CR-V?

P0139 indicates that the secondary heated oxygen sensor 2 is responding slowly, which can impact the vehicle's emissions and fuel efficiency.

What are the common symptoms associated with the P0139 code?

Common symptoms include poor fuel economy, rough engine performance, increased emissions, and the check engine light being illuminated.

What could cause the P0139 code to trigger in a Honda CR-V?

Potential causes include a faulty secondary oxygen sensor, exhaust leaks, wiring issues, or problems with the engine control module (ECM).

How can I diagnose the issue related to the P0139 code?

You can start by visually inspecting the oxygen sensor and its wiring for damage, checking for exhaust leaks, and using a scan tool to monitor the sensor's voltage and response time.

Is it safe to drive my Honda CR-V with the P0139 code?

While it may be safe to drive, it is advisable to address the issue promptly to avoid potential damage to the engine or increased emissions.

What repairs are commonly needed to fix the P0139 code?

Common repairs may include replacing the secondary oxygen sensor, fixing any wiring issues, or sealing exhaust leaks.

How can I prevent the P0139 code from occurring again?

Regular maintenance, including checking the exhaust system and ensuring proper sensor operation, can help prevent the recurrence of this code.

Will clearing the P0139 code resolve the issue permanently?

Clearing the code may turn off the check engine light temporarily, but if the underlying issue isn't fixed, the code is likely to return.

Can I replace the oxygen sensor myself to fix the P0139 code?

If you have mechanical experience and the proper tools, you can replace the oxygen sensor yourself. However, ensure you follow safety guidelines and consult the vehicleâ€™s service manual.