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P0139 2006 Nissan Maxima Code - HO2S12 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for a 2006 Nissan Maxima refers to a slow response from the downstream oxygen sensor (HO2S12). Common causes include Faulty downstream oxygen sensor, Wiring issues or electrical connection problems, Exhaust leaks near the 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 2006 Nissan Maxima indicates HO2S12 Slow Response.
Common causes
Common causes include Faulty downstream oxygen sensor, Wiring issues or electrical connection problems, Exhaust leaks near the 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 15, 2024
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Code P0139 2006 Nissan Maxima Description

The P0139 diagnostic trouble code (DTC) for a 2006 Nissan Maxima refers to a slow response from the downstream oxygen sensor (HO2S12). The downstream oxygen sensor is located after the catalytic converter and is responsible for monitoring the efficiency of the catalytic converter and adjusting fuel trim to optimize emissions and fuel economy. When the sensor detects a slow response, it means that the sensor is not reacting quickly enough to changes in the exhaust gases, which can lead to incorrect fuel mixture and potentially higher emissions.

OBDII Code P0139 2006 Nissan Maxima - HO2S12 Slow Response
P0139 2006 Nissan Maxima Code - HO2S12 Slow Response

Common Causes of P0139 2006 Nissan Maxima

  1. Faulty downstream oxygen sensor
  2. Wiring issues or electrical connection problems
  3. Exhaust leaks near the sensor
  4. Engine running too rich or too lean
  5. Faulty catalytic converter

Symptoms of P0139 2006 Nissan Maxima

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Reduced engine performance
  5. Increased emissions

How to Fix P0139 2006 Nissan Maxima

  1. Begin by diagnosing the issue using a scan tool to confirm the P0139 code and check the downstream oxygen sensor's response time.
  2. Inspect the wiring and connections to the downstream oxygen sensor for any damage or corrosion. Repair or replace as needed.
  3. Check for exhaust leaks near the sensor and repair any leaks found.
  4. Test the engine's air-fuel mixture to ensure it is within the proper range. Adjust as necessary.
  5. If the downstream oxygen sensor is determined to be faulty, replace it with a new sensor following the manufacturer's recommendations.

Cost to Fix P0139 2006 Nissan Maxima

The cost of repairing a P0139 code on a 2006 Nissan Maxima can vary depending on the specific cause of the issue. In general, the cost of replacing a downstream oxygen sensor can range from $150 to $300, including parts and labor. Additional costs may be incurred if wiring repairs or other components need to be replaced. It is advisable to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on the specific circumstances of your vehicle. Keep in mind that labor rates can vary, so it's essential to inquire about rates in your area before proceeding with the repair.

What does this mean?

Tech Notes for P0139 2006 Nissan Maxima

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 2006 Nissan Maxima Code

1. What are the common symptoms of OBDII code P0139 in a 2006 Nissan Maxima?

- Common symptoms include poor fuel efficiency, rough idling, engine misfires, and the illumination of the Check Engine Light.

2. What does the OBDII code P0139 for a 2006 Nissan Maxima indicate?

- The code P0139 indicates that the downstream oxygen sensor (HO2S12) is experiencing a slow response or is not functioning properly.

3. What are the possible causes of the HO2S12 slow response code in a 2006 Nissan Maxima?

- Possible causes include a faulty oxygen sensor, wiring issues, exhaust leaks, fuel system problems, or issues with the engine's air-fuel mixture.

4. How can I diagnose the cause of the HO2S12 slow response code in my 2006 Nissan Maxima?

- Diagnosis typically involves checking the oxygen sensor's wiring, inspecting for exhaust leaks, testing the sensor's functionality, and ensuring proper fuel system operation.

5. Can a dirty or contaminated oxygen sensor cause the P0139 code in a 2006 Nissan Maxima?

- Yes, a dirty or contaminated oxygen sensor can contribute to a slow response and trigger the P0139 code in your Nissan Maxima.

6. What is the recommended repair for OBDII code P0139 in a 2006 Nissan Maxima?

- The recommended repair often involves replacing the downstream oxygen sensor (HO2S12) to address the slow response issue and clear the code.

7. Is it safe to continue driving my 2006 Nissan Maxima with the P0139 code?

- While the vehicle may still be operable, it is recommended to address the underlying issue causing the code to prevent potential damage to the catalytic converter and ensure optimal engine performance.

8. Can a DIY enthusiast easily replace the downstream oxygen sensor in a 2006 Nissan Maxima?

- Yes, replacing the downstream oxygen sensor is considered a moderately challenging DIY repair that requires basic tools and some mechanical knowledge.

9. How can I prevent the OBDII code P0139 from recurring in my 2006 Nissan Maxima after repair?

- To prevent code recurrence, ensure proper installation of the new oxygen sensor, address any underlying issues such as exhaust leaks, and perform regular maintenance on the vehicle's fuel system.

10. Will resetting the Check Engine Light after replacing the oxygen sensor clear the P0139 code in a 2006 Nissan Maxima?

- Yes, resetting the Check Engine Light after replacing the oxygen sensor will clear the P0139 code, but the code may return if the underlying issue is not fully resolved.

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