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P0139 2008 Nissan Maxima Code - HO2S12 Slow Response

Quick Answer

The diagnostic trouble code P0139 in a 2008 Nissan Maxima refers to an issue with the HO2S12 sensor, which is the Heated Oxygen Sensor located after the catalytic converter in bank 1. Common causes include Contaminated or dirty HO2S12 sensor, Faulty sensor, Wiring issues. 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 2008 Nissan Maxima indicates HO2S12 Slow Response.
Common causes
Common causes include Contaminated or dirty HO2S12 sensor, Faulty sensor, Wiring issues.
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 11, 2024
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Code P0139 2008 Nissan Maxima Description

The diagnostic trouble code P0139 in a 2008 Nissan Maxima refers to an issue with the HO2S12 sensor, which is the Heated Oxygen Sensor located after the catalytic converter in bank 1. The code specifically indicates a slow response from this sensor, which means that it is not reacting quickly enough to changes in the air-fuel mixture ratio. This can lead to a variety of performance issues and potentially cause damage to the catalytic converter over time.

OBDII Code P0139 2008 Nissan Maxima - HO2S12 Slow Response
P0139 2008 Nissan Maxima Code - HO2S12 Slow Response

Common Causes of P0139 2008 Nissan Maxima

  1. Contaminated or dirty HO2S12 sensor
  2. Faulty sensor
  3. Wiring issues
  4. Exhaust leaks
  5. ECM problems

Symptoms of P0139 2008 Nissan Maxima

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Increased emissions
  5. Engine hesitation or surging

How to Fix P0139 2008 Nissan Maxima

  1. Begin by diagnosing the issue using a scan tool to confirm the P0139 code and identify the specific problem with the HO2S12 sensor.
  2. Inspect the sensor and its wiring for any signs of damage, corrosion, or contamination. Clean the sensor if necessary, or replace it if it is faulty.
  3. Check for exhaust leaks and repair any leaks found in the system.
  4. Clear the diagnostic trouble codes from the ECM and reset the system to see if the issue has been resolved.
  5. Test drive the vehicle to ensure that the symptoms associated with the P0139 code have been eliminated.

Cost to Fix P0139 2008 Nissan Maxima

The cost of repairing a P0139 code on a 2008 Nissan Maxima can vary depending on the specific cause of the issue and the cost of parts and labor in your area. Typically, replacing an oxygen sensor can cost between $200 and $300, including parts and labor. However, if additional repairs or diagnostic work are needed, the total cost could be higher. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your individual circumstances. Keep in mind that labor rates can vary widely, so it's a good idea to shop around for the best price.

What does this mean?

Tech Notes for P0139 2008 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 2008 Nissan Maxima Code

1. What does OBDII code P0139 on a 2008 Nissan Maxima indicate?

Code P0139 indicates a slow response from the HO2S12 (Heated Oxygen Sensor Bank 1 Sensor 2) in the exhaust system of the vehicle.

2. What are common symptoms of OBDII code P0139 on a 2008 Nissan Maxima?

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

3. What are potential causes of OBDII code P0139 on a 2008 Nissan Maxima?

Potential causes of code P0139 include a faulty HO2S12 sensor, wiring issues in the sensor circuit, exhaust leaks, or an engine running rich or lean.

4. How can I diagnose the cause of OBDII code P0139 on a 2008 Nissan Maxima?

Diagnosing code P0139 may involve visually inspecting the sensor and its wiring, performing voltage and resistance tests on the sensor, checking for exhaust leaks, and analyzing fuel trim data with a scan tool.

5. Can I continue driving my 2008 Nissan Maxima with OBDII code P0139?

While the vehicle may still be operable with code P0139, it is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal performance.

6. How can I repair OBDII code P0139 on a 2008 Nissan Maxima?

Repair options may include replacing the HO2S12 sensor, repairing or replacing damaged wiring, fixing exhaust leaks, addressing any underlying fuel system issues, and clearing the trouble code.

7. Is it possible to reset OBDII code P0139 on a 2008 Nissan Maxima without fixing the issue?

While you can clear the trouble code with an OBDII scanner, it is not recommended to do so without addressing the underlying cause, as the issue may persist and trigger the code again.

8. How much does it cost to fix OBDII code P0139 on a 2008 Nissan Maxima?

The cost of fixing code P0139 can vary depending on the root cause of the issue, the labor rates of the repair shop, and the price of any necessary parts. It is advisable to obtain quotes from different mechanics or dealerships.

9. Can a DIY enthusiast repair OBDII code P0139 on a 2008 Nissan Maxima?

Depending on your skill level and access to tools, DIY enthusiasts may be able to address some aspects of the repair, such as replacing the sensor or fixing minor wiring issues. However, more complex diagnostics and repairs may require professional assistance.

10. How often does OBDII code P0139 occur in a 2008 Nissan Maxima?

Code P0139 can occur sporadically or more frequently depending on the condition of the vehicle, driving habits, and maintenance history. If the issue persists, it is essential to diagnose and address it promptly.

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