AutoCodes – Honda – P0139 2000 Honda Civic

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

Quick Answer

The Heated Oxygen Sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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 2000 Honda Civic indicates HO2S Bank 1 Sensor 2 Slow Response.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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 8,375

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 Mar 31, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0139 2000 Honda Civic Description

The Heated Oxygen Sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0139 2000 Honda Civic - HO2S Bank 1 Sensor 2 Slow Response - AutoCodes.com — P0139 2000 Honda Civic Code - HO2S Bank 1 Sensor 2 Slow Response

What does this mean?

What are the Possible Causes of the DTC P0139 2000 Honda Civic?

Faulty Rear Heated Oxygen Sensor Bank 1
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0139 2000 Honda Civic?

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 2000 Honda Civic 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 2000 Honda Civic 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 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.