AutoCodes – Honda – P0139 2010 Honda Accord

P0139 2010 Honda Accord 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 2010 Honda Accord 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 9,820

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0139 2010 Honda Accord 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 2010 Honda Accord - HO2S Bank 1 Sensor 2 Slow Response - AutoCodes.com — P0139 2010 Honda Accord Code - HO2S Bank 1 Sensor 2 Slow Response

What does this mean?

What are the Possible Causes of the DTC P0139 2010 Honda Accord?

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 2010 Honda Accord?

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 2010 Honda Accord 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.

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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.