Engine-Codes.com
Engine-Codes – Nissan – P0139 2011 Nissan Pathfinder

P0139 2011 Nissan Pathfinder Code - HO2S12 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for the 2011 Nissan Pathfinder indicates a slow response from the downstream oxygen sensor (HO2S12) located after the catalytic converter. Common causes include Faulty downstream oxygen sensor, Wiring or connector issues in the oxygen sensor circuit, 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 2011 Nissan Pathfinder indicates HO2S12 Slow Response.
Common causes
Common causes include Faulty downstream oxygen sensor, Wiring or connector issues in the oxygen sensor circuit, 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 08, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0139 2011 Nissan Pathfinder Description

The P0139 diagnostic trouble code (DTC) for the 2011 Nissan Pathfinder indicates a slow response from the downstream oxygen sensor (HO2S12) located after the catalytic converter. The oxygen sensor plays a crucial role in measuring the amount of oxygen in the exhaust gases, allowing the engine control module (ECM) to adjust the air-fuel mixture for optimal performance and emissions control. A slow response from the oxygen sensor can lead to inaccurate readings and disrupt the engine's operation.

OBDII Code P0139 2011 Nissan Pathfinder - HO2S12 Slow Response
P0139 2011 Nissan Pathfinder Code - HO2S12 Slow Response

Common Causes of P0139 2011 Nissan Pathfinder

  1. Faulty downstream oxygen sensor
  2. Wiring or connector issues in the oxygen sensor circuit
  3. Exhaust leaks near the oxygen sensor
  4. Contaminated or damaged catalytic converter
  5. ECM software issues

Symptoms of P0139 2011 Nissan Pathfinder

  1. Check engine light illuminated on the dashboard
  2. Reduced fuel efficiency
  3. Rough idling or stalling
  4. Engine misfires
  5. Failed emissions tests

How to Fix P0139 2011 Nissan Pathfinder

  1. Use an OBD-II scanner to confirm the P0139 code and diagnose the downstream oxygen sensor's slow response.
  2. Inspect the wiring and connectors in the oxygen sensor circuit for any damage or corrosion. Repair or replace as needed.
  3. Check for exhaust leaks near the oxygen sensor and repair them to prevent false readings.
  4. Replace the downstream oxygen sensor if it is faulty or not responding properly.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0139 2011 Nissan Pathfinder

The cost of repairing a P0139 code on a 2011 Nissan Pathfinder can vary depending on the specific cause of the issue. In general, the price range for replacing a downstream oxygen sensor and addressing related wiring or exhaust leaks can range from $150 to $400 for parts and labor. Additional costs may be incurred if the catalytic converter needs to be replaced or if there are other underlying issues contributing to the slow response of the oxygen sensor. It is recommended to consult with a qualified mechanic or auto repair shop for an accurate cost estimate based on the vehicle's condition and location.

What does this mean?

Tech Notes for P0139 2011 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.

Need more information about the P0139 2011 Nissan Pathfinder code?

Need more information on how to fix the P0139 2011 Nissan Pathfinder code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0139 2011 Nissan Pathfinder code diagnosed by a professional: Find a repair shop in your area

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 2011 Nissan Pathfinder Code

1. What does OBDII code P0139 for a 2011 Nissan Pathfinder mean?

- This code, also known as HO2S12 Slow Response, indicates that the oxygen sensor in bank 1 sensor 2 is not responding as quickly as expected.

2. What are the common symptoms of OBDII code P0139 on a 2011 Nissan Pathfinder?

- Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the Check Engine Light.

3. What are the potential causes of OBDII code P0139 on a 2011 Nissan Pathfinder?

- The code can be triggered by issues such as a faulty oxygen sensor, wiring problems, exhaust leaks, or issues with the engine's air-fuel ratio.

4. How can I diagnose the OBDII code P0139 on my 2011 Nissan Pathfinder?

- Diagnosing this code typically involves checking the oxygen sensor's wiring, inspecting for exhaust leaks, and testing the sensor's response time using a scan tool.

5. Can I drive my 2011 Nissan Pathfinder with an active P0139 trouble code?

- While the vehicle may still be driveable with this code, it is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

6. How can I repair OBDII code P0139 on my 2011 Nissan Pathfinder?

- Repair options may include replacing the oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, or addressing any underlying issues affecting the air-fuel mixture.

7. How much does it typically cost to fix OBDII code P0139 on a 2011 Nissan Pathfinder?

- The cost of repair can vary depending on the specific cause of the code and the labor rates in your area. Replacement oxygen sensors can range from $50 to $200, with additional costs for labor.

8. Are there any maintenance tips to prevent OBDII code P0139 on a 2011 Nissan Pathfinder?

- Regular maintenance, such as replacing oxygen sensors at recommended intervals, inspecting for exhaust leaks, and using quality fuel, can help prevent issues that trigger this code.

9. Can resetting the Check Engine Light clear the OBDII code P0139 on a 2011 Nissan Pathfinder?

- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return after driving cycles.

10. Is it safe to ignore OBDII code P0139 on a 2011 Nissan Pathfinder?

- Ignoring this code can lead to decreased fuel efficiency, potential engine damage, and may cause the vehicle to fail emissions tests. It is advisable to address the issue promptly.

Discuss the causes and fixes for P0139 2011 Nissan Pathfinder OBDII Code

Submit a New Comment

Code P0139 2011 Nissan Pathfinder comments

No comments found for this page.