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P0139 2000 Honda Civic Code - HO2S Bank 1 Sensor 2 Slow Response

Quick Answer

The P0139 code on a 2000 Honda Civic indicates an issue with the HO2S (Heated Oxygen Sensor) Bank 1 Sensor 2, specifically a slow response from the sensor. Common causes include Faulty HO2S Bank 1 Sensor 2, Wiring issues or poor connections, 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 2000 Honda Civic indicates HO2S Bank 1 Sensor 2 Slow Response.
Common causes
Common causes include Faulty HO2S Bank 1 Sensor 2, Wiring issues or poor connections, 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 2000 Honda Civic Description

The P0139 code on a 2000 Honda Civic indicates an issue with the HO2S (Heated Oxygen Sensor) Bank 1 Sensor 2, specifically a slow response from the sensor. The HO2S is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. In this case, a slow response from the sensor can lead to incorrect fuel delivery, affecting the overall performance and efficiency of the vehicle.

OBDII Code P0139 2000 Honda Civic - HO2S Bank 1 Sensor 2 Slow Response
P0139 2000 Honda Civic Code - HO2S Bank 1 Sensor 2 Slow Response

Common Causes of P0139 2000 Honda Civic

  1. Faulty HO2S Bank 1 Sensor 2
  2. Wiring issues or poor connections
  3. Exhaust leaks near the sensor
  4. Malfunctioning ECM
  5. Contaminated sensor due to oil or coolant leaks

Symptoms of P0139 2000 Honda Civic

  1. Decreased fuel efficiency
  2. Rough idling
  3. Hesitation during acceleration
  4. Increased emissions
  5. Check Engine Light illuminated

How to Fix P0139 2000 Honda Civic

  1. Use an OBD-II scanner to retrieve the specific error code and confirm the issue.
  2. Inspect the wiring and connections of the HO2S Bank 1 Sensor 2 for any damage or corrosion.
  3. Test the sensor's response time using a multimeter or oscilloscope.
  4. Replace the HO2S Bank 1 Sensor 2 if it is found to be faulty.
  5. Clear the error code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0139 2000 Honda Civic

The cost of repairing a HO2S Bank 1 Sensor 2 slow response code on a 2000 Honda Civic can vary depending on the specific cause of the issue and the cost of parts and labor. Typically, the cost of a new oxygen sensor ranges from $50 to $200, while the labor cost for installation can be around $100 to $200. Therefore, the total repair cost can range from $150 to $400. It is advisable to obtain quotes from local auto repair shops to get a more accurate estimate based on your location and the specific circumstances of your vehicle.

What does this mean?

Tech Notes for P0139 2000 Honda Civic

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.

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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 2000 Honda Civic Code

1. What are the common symptoms of OBDII code P0139 on a 2000 Honda Civic?

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

2. What does the OBDII code P0139 for a 2000 Honda Civic indicate?

- The code P0139 indicates that the downstream oxygen sensor (HO2S Bank 1 Sensor 2) is experiencing a slow response to changes in oxygen levels in the exhaust.

3. What are the possible causes of a slow response from the HO2S Bank 1 Sensor 2 on a 2000 Honda Civic?

- Possible causes include a faulty oxygen sensor, wiring issues, exhaust leaks, engine misfires, or a malfunctioning catalytic converter.

4. How can I diagnose the cause of the slow response from the HO2S Bank 1 Sensor 2 on my 2000 Honda Civic?

- Diagnose by checking the oxygen sensor's wiring and connections, inspecting for exhaust leaks, performing an engine misfire diagnosis, and testing the functioning of the catalytic converter.

5. Can a dirty or contaminated oxygen sensor cause the P0139 code on a 2000 Honda Civic?

- Yes, a dirty or contaminated oxygen sensor can lead to a slow response and trigger the P0139 code. It is essential to ensure the sensor is clean and functioning correctly.

6. What are some repair tips for resolving the P0139 code on a 2000 Honda Civic?

- Repair tips include replacing the oxygen sensor if faulty, repairing any damaged wiring, fixing exhaust leaks, addressing engine misfires, and replacing the catalytic converter if necessary.

7. Is it safe to continue driving a 2000 Honda Civic with the P0139 code illuminated?

- It is not recommended to drive for an extended period with the P0139 code illuminated, as it can lead to poor engine performance and potentially cause damage to the catalytic converter.

8. How long does it typically take to repair the P0139 code on a 2000 Honda Civic?

- The repair time for the P0139 code can vary depending on the exact cause. Simple fixes like replacing the oxygen sensor can be done relatively quickly, while more complex issues may take longer to diagnose and repair.

9. Can I reset the check engine light after repairing the P0139 code on my 2000 Honda Civic?

- Yes, after repairing the issue causing the P0139 code, you can reset the check engine light using an OBDII scanner or by disconnecting the car's battery for a few minutes.

10. Will fixing the P0139 code improve the overall performance and fuel efficiency of my 2000 Honda Civic?

- Yes, resolving the P0139 code and ensuring proper functioning of the oxygen sensor can lead to improved engine performance and better fuel efficiency in your Honda Civic.

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