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P0139 2010 Nissan Pathfinder Code - HO2S12 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for a 2010 Nissan Pathfinder refers to a slow response from the downstream oxygen sensor (HO2S12). Common causes include Faulty downstream oxygen sensor (HO2S12), Wiring issues or poor electrical connections, Exhaust leaks near the oxygen 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 Nissan Pathfinder indicates HO2S12 Slow Response.
Common causes
Common causes include Faulty downstream oxygen sensor (HO2S12), Wiring issues or poor electrical connections, Exhaust leaks near the oxygen 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 17, 2024
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Code P0139 2010 Nissan Pathfinder Description

The P0139 diagnostic trouble code (DTC) for a 2010 Nissan Pathfinder refers to a slow response from the downstream oxygen sensor (HO2S12). The oxygen sensor is a crucial component of the vehicle's emissions control system, 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. A slow response from the oxygen sensor can lead to inaccurate readings, affecting the engine's performance and emissions output.

OBDII Code P0139 2010 Nissan Pathfinder - HO2S12 Slow Response
P0139 2010 Nissan Pathfinder Code - HO2S12 Slow Response

Common Causes of P0139 2010 Nissan Pathfinder

  1. Faulty downstream oxygen sensor (HO2S12)
  2. Wiring issues or poor electrical connections
  3. Exhaust leaks near the oxygen sensor
  4. Engine misfires or running rich/lean conditions
  5. Faulty ECM or other related components

Symptoms of P0139 2010 Nissan Pathfinder

  1. Check engine light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Increased emissions output
  5. Engine hesitation or misfiring

How to Fix P0139 2010 Nissan Pathfinder

  1. Use an OBD-II scanner to confirm the P0139 code and identify the downstream oxygen sensor (HO2S12).
  2. Inspect the wiring and connections to the oxygen sensor for any damage or corrosion.
  3. Check for exhaust leaks near the sensor and repair as necessary.
  4. Test the oxygen sensor's response time using a multimeter or oscilloscope and replace if it does not meet specifications.
  5. Clear the DTC and reset the ECM to see if the code returns after repairs.

Cost to Fix P0139 2010 Nissan Pathfinder

The typical repair costs for addressing a P0139 code on a 2010 Nissan Pathfinder can range from $150 to $400, including parts and labor. The specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to inquire about local rates to get a more accurate estimate for this repair.

What does this mean?

Tech Notes for P0139 2010 Nissan Pathfinder

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 2010 Nissan Pathfinder Code

1. What are the common symptoms of OBDII code P0139 on a 2010 Nissan Pathfinder?

- Common symptoms include poor fuel economy, rough idling, and a Check Engine light illuminated on the dashboard.

2. What does the OBDII code P0139 "HO2S12 Slow Response" mean for a 2010 Nissan Pathfinder?

- This code indicates that the downstream oxygen sensor (sensor 2 in bank 1) is responding slowly to changes in the exhaust oxygen content.

3. What are the possible causes of OBDII code P0139 on a 2010 Nissan Pathfinder?

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

4. How can I diagnose the root cause of OBDII code P0139 on my 2010 Nissan Pathfinder?

- Diagnosing this code typically involves checking the oxygen sensor's wiring, inspecting for exhaust leaks, testing the sensor's response, and verifying proper engine operation.

5. Can I continue driving my 2010 Nissan Pathfinder with OBDII code P0139?

- It is generally not recommended to continue driving with this code as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

6. How can I repair OBDII code P0139 on a 2010 Nissan Pathfinder?

- Repair options may include replacing the downstream oxygen sensor, repairing wiring issues, fixing exhaust leaks, addressing engine misfires, or replacing a faulty catalytic converter.

7. Is it possible to reset the Check Engine light after repairing OBDII code P0139 on a 2010 Nissan Pathfinder?

- Yes, the Check Engine light can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes. However, it's important to ensure that the underlying issue has been resolved first.

8. How much does it typically cost to repair OBDII code P0139 on a 2010 Nissan Pathfinder?

- The cost of repairs can vary depending on the exact cause of the code, but it may range from $100 to $500 or more, including parts and labor.

9. Can a DIY enthusiast fix OBDII code P0139 on a 2010 Nissan Pathfinder?

- Depending on the root cause, some DIY enthusiasts with the necessary tools and knowledge may be able to address this code themselves, particularly if it involves simple tasks like replacing the oxygen sensor.

10. How often does OBDII code P0139 occur in 2010 Nissan Pathfinders?

- While the frequency can vary, P0139 is a relatively common OBDII code seen in vehicles with oxygen sensor or exhaust system issues, including the 2010 Nissan Pathfinder.

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