P0139 2009 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 2009 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.
Code P0139 2009 Honda Accord Description
What are the Possible Causes of the DTC P0139 2009 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 2009 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0139 2009 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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Frequently Asked Questions about P0139 2009 Honda Accord Code
1. What are the common symptoms of OBDII code P0139 on a 2009 Honda Accord?
- Common symptoms include poor fuel efficiency, rough idling, engine hesitation, and the illumination of the check engine light.
2. What does the HO2S Bank 1 Sensor 2 Slow Response code indicate in a 2009 Honda Accord?
- This code indicates that the oxygen sensor downstream of the catalytic converter in bank 1 is not responding quickly enough to changes in the air-fuel mixture.
3. What are the possible causes of the HO2S Bank 1 Sensor 2 Slow Response code on a 2009 Honda Accord?
- Possible causes include a faulty oxygen sensor, wiring issues, exhaust leaks, engine misfires, or a malfunctioning catalytic converter.
4. How can I diagnose the HO2S Bank 1 Sensor 2 Slow Response code on my 2009 Honda Accord?
- Diagnosis typically involves using an OBDII scanner to read the code, checking the oxygen sensor's wiring and connections, and performing tests to identify the root cause of the slow sensor response.
5. Is it safe to continue driving my 2009 Honda Accord with the P0139 code present?
- It is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.
6. Can I reset the check engine light after fixing the HO2S Bank 1 Sensor 2 Slow Response issue on my 2009 Honda Accord?
- Yes, once the underlying problem is fixed, the check engine light can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes.
7. How much does it typically cost to repair the HO2S Bank 1 Sensor 2 Slow Response problem on a 2009 Honda Accord?
- The cost of repair can vary depending on the cause of the issue, but it may involve replacing the oxygen sensor, repairing wiring, or addressing other related components. Costs can range from $100 to $400 or more.
8. Can I fix the HO2S Bank 1 Sensor 2 Slow Response issue on my 2009 Honda Accord myself?
- DIY repair is possible for some individuals, especially if experienced with automotive maintenance. However, it's recommended to consult a professional if unsure about diagnosing or fixing the problem.
9. How often does the HO2S Bank 1 Sensor 2 Slow Response code occur in a 2009 Honda Accord?
- While the frequency can vary, this code may occur intermittently or as a one-time occurrence, depending on the specific issue causing the slow sensor response.
10. Will the HO2S Bank 1 Sensor 2 Slow Response issue affect the overall performance of my 2009 Honda Accord?
- Yes, unresolved issues related to this code can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.
Discuss the causes and fixes for P0139 2009 Honda Accord OBDII Code
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Check engine came on, I ran the code reader and resulted with P0139 HONDA - HO2S Bank 1 Sensor 2 Slow Response. I am replacing it ASAP.
Can anyone give me a detail location for it (photos/diagrams)?
Thank you
-
Do you have 4 or 6 Cyl? Here are the only images I got.
Location for the 6 Cylinder engine. Bank 1 Sensor 2 (Rear)
1. Raise the vehicle on a lift.
2. Disconnect the rear secondary HO2S 4P connector (A), and remove the harness clamps (B).
Location of Rear Secondary HO2S 4P Connector And Harness Clamps With Torque Specifications
3. Remove rear secondary HO2S (C).
4. Install the parts in the reverse order of removal.
Click here to enlarge imageLocation for the 4 Cylinder engine
Click here to enlarge image -
Thank you. I replace it. Now I have to run the car until the evap cycle completes.
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