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P0139 Honda Code - Secondary Heated Oxygen Sensor 2 Slow Response

Quick Answer

The P0139 code for Honda vehicles indicates a slow response from the Secondary Heated Oxygen Sensor 2 (HO2S2). Common causes include Faulty Secondary Heated Oxygen Sensor 2, Wiring or connector issues, Exhaust system leaks. 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 Honda indicates Secondary Heated Oxygen Sensor 2 Slow Response.
Common causes
Common causes include Faulty Secondary Heated Oxygen Sensor 2, Wiring or connector issues, Exhaust system leaks.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0139 Honda Description

The P0139 code for Honda vehicles indicates a slow response from the Secondary Heated Oxygen Sensor 2 (HO2S2). This sensor is responsible for monitoring the oxygen levels in the exhaust gases after they have passed through the catalytic converter. A slow response from this sensor can lead to incorrect readings being sent to the engine control module (ECM), which can negatively impact the vehicle's performance and emissions.

OBDII Code P0139 Honda - Secondary Heated Oxygen Sensor 2 Slow Response
P0139 Honda Code - Secondary Heated Oxygen Sensor 2 Slow Response

Common Causes of P0139 Honda

  1. Faulty Secondary Heated Oxygen Sensor 2
  2. Wiring or connector issues
  3. Exhaust system leaks
  4. Engine vacuum leaks
  5. Exhaust system contamination

Symptoms of P0139 Honda

  1. Decreased fuel efficiency
  2. Engine misfires or hesitation
  3. Rough idling or stalling
  4. Check Engine Light illuminated
  5. Failed emissions test

How to Fix P0139 Honda

  1. Diagnose the code using a scan tool to verify the issue with the Secondary Heated Oxygen Sensor 2.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion.
  3. Replace the Secondary Heated Oxygen Sensor 2 if it is found to be faulty.
  4. Clear the code from the ECM memory and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the exhaust system or engine components.

Cost to Fix P0139 Honda

The cost of repairing a P0139 code on a Honda vehicle can vary depending on the specific model and the extent of the issue. Typically, the price for a new Secondary Heated Oxygen Sensor 2 ranges from $50 to $200, with additional costs for labor. Overall, the repair process can cost between $150 and $400, including parts and labor. It is recommended to consult with a trusted auto repair shop to get an accurate estimate based on your vehicle's make and model. Additionally, factors such as location and labor rates can influence the final repair costs.

What does this mean?

Tech Notes for P0139 Honda

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





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Information for Specific Honda Models

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 Honda Code

1. What are the common symptoms of OBDII code P0139 in a Honda?

- Common symptoms include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.

2. What does the OBDII code P0139 in a Honda indicate?

- The code indicates a slow response from the secondary heated oxygen sensor 2, also known as the downstream oxygen sensor.

3. What are the possible causes of code P0139 in a Honda?

- Potential causes include a faulty secondary heated oxygen sensor, wiring issues, exhaust leaks, or a problem with the engine's air-fuel mixture.

4. How can I diagnose the source of the P0139 code in my Honda?

- You can use an OBDII scanner to retrieve the code and then inspect the secondary heated oxygen sensor, check for wiring damage, and look for any exhaust leaks.

5. Can I drive my Honda with the P0139 code present?

- It is generally safe to drive with the code, but it is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

6. How can I repair the P0139 code in my Honda?

- Repair options may include replacing the secondary heated oxygen sensor, repairing or replacing damaged wiring, fixing any exhaust leaks, or addressing issues with the air-fuel mixture.

7. Is it possible to reset the P0139 code in a Honda without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, the check engine light is likely to reappear if the root cause of the problem is not resolved.

8. How much does it typically cost to fix the P0139 code in a Honda?

- The cost of repair can vary depending on the specific issue causing the code, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast fix the P0139 code in a Honda at home?

- If you have experience working on cars and the necessary tools, you may be able to replace the secondary heated oxygen sensor or address wiring issues yourself. However, diagnosing and fixing exhaust leaks or air-fuel mixture problems may require professional assistance.

10. How often does the P0139 code occur in Honda vehicles?

- The P0139 code can occur in Honda vehicles, particularly in older models or those with high mileage, due to sensor degradation, wiring issues, or exhaust system wear and tear.

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