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P0139 2010 Honda Accord Code - HO2S Bank 1 Sensor 2 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for a 2010 Honda Accord indicates an issue with the HO2S (Heated Oxygen Sensor) Bank 1 Sensor 2. Common causes include Faulty oxygen sensor, Wiring or connector issues, Exhaust leaks near the sensor. 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 2010 Honda Accord indicates HO2S Bank 1 Sensor 2 Slow Response.
Common causes
Common causes include Faulty oxygen sensor, Wiring or connector issues, Exhaust leaks near the sensor.
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 11, 2024
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Code P0139 2010 Honda Accord Description

The P0139 diagnostic trouble code (DTC) for a 2010 Honda Accord indicates an issue with the HO2S (Heated Oxygen Sensor) Bank 1 Sensor 2. This code specifically points to a slow response from the sensor located after the catalytic converter on the bank 1 side of the engine. The oxygen sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases, providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion.

OBDII Code P0139 2010 Honda Accord - HO2S Bank 1 Sensor 2 Slow Response
P0139 2010 Honda Accord Code - HO2S Bank 1 Sensor 2 Slow Response

Common Causes of P0139 2010 Honda Accord

  1. Faulty oxygen sensor
  2. Wiring or connector issues
  3. Exhaust leaks near the sensor
  4. Contaminated sensor from oil or coolant leaks
  5. Exhaust system damage or blockage

Symptoms of P0139 2010 Honda Accord

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Poor acceleration or hesitation
  5. Increased emissions

How to Fix P0139 2010 Honda Accord

  1. Begin by performing a visual inspection of the wiring harness and connector to the oxygen sensor. Look for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  2. Use a scan tool to monitor the oxygen sensor's response time and voltage output. Compare the readings to specifications provided by the manufacturer.
  3. If the sensor is deemed faulty, replace it with a new OEM or quality aftermarket sensor. Follow the manufacturer's instructions for installation and calibration.
  4. Clear the DTC from the ECM memory using a scan tool and test drive the vehicle to ensure the code does not return.
  5. If the issue persists, further diagnostics may be required to check for underlying engine or exhaust system problems that could be affecting the sensor's performance.

Cost to Fix P0139 2010 Honda Accord

The cost of repairing a HO2S Bank 1 Sensor 2 slow response code on a 2010 Honda Accord can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $150 to $300 for the replacement sensor itself. Labor costs can range from $100 to $200, with total repair costs falling between $250 and $500. Keep in mind that these estimates are rough averages and actual costs may differ based on your location and the severity of the problem. It's recommended to consult with a trusted mechanic or dealership for a more accurate cost estimate tailored to your circumstances.

What does this mean?

Tech Notes for P0139 2010 Honda Accord

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

When is the Code Detected?

The P0139 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor takes more time to respond between rich and lean than the specified time.

Need more information about the P0139 2010 Honda Accord code?

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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 2010 Honda Accord Code

1. What are the common symptoms of OBDII code P0139 in a 2010 Honda Accord?

- Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the check engine light.

2. What does the code P0139 on a 2010 Honda Accord indicate?

- OBDII code P0139 specifically refers to a slow response from the downstream oxygen sensor (HO2S) located in Bank 1 Sensor 2 of the exhaust system.

3. What are the possible causes of the HO2S Bank 1 Sensor 2 slow response error in a 2010 Honda Accord?

- Potential causes include a faulty oxygen sensor, wiring or electrical issues, exhaust leaks, engine misfires, or a problem with the fuel system.

4. How can I diagnose and repair the HO2S Bank 1 Sensor 2 slow response issue in my 2010 Honda Accord?

- Start by inspecting the oxygen sensor and its wiring for damage or corrosion. Check for exhaust leaks and address any engine performance issues. If necessary, replace the oxygen sensor.

5. Can driving with the P0139 code present harm my 2010 Honda Accord?

- While driving with the code may not cause immediate harm, it can lead to reduced fuel efficiency and potential long-term damage to the catalytic converter if left unresolved.

6. Is it possible to reset the check engine light after addressing the P0139 error in a 2010 Honda Accord?

- Yes, after repairing the underlying issue causing the code, you can reset the check engine light using an OBDII scanner or by disconnecting the car's battery for a few minutes.

7. How much does it typically cost to replace the HO2S Bank 1 Sensor 2 in a 2010 Honda Accord?

- The cost of replacing the oxygen sensor can vary based on the model of the sensor and labor rates, but it generally ranges from $100 to $300 for parts and labor.

8. Will a dirty or clogged air filter cause the P0139 error code in a 2010 Honda Accord?

- While a dirty air filter can impact engine performance, it is not a direct cause of the HO2S Bank 1 Sensor 2 slow response code. Focus on checking the oxygen sensor and related components.

9. Can I drive my 2010 Honda Accord with the P0139 code temporarily until I can get it fixed?

- It's generally safe to drive the vehicle for a short period with the code present, but it's recommended to address the issue promptly to prevent potential damage and ensure optimal performance.

10. How long does it typically take to diagnose and repair the P0139 error in a 2010 Honda Accord?

- The diagnosis and repair process for the HO2S Bank 1 Sensor 2 slow response code can vary depending on the exact cause, but it usually takes a few hours to a day at a qualified repair shop.

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