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Engine-Codes – Nissan – P0139 2008 Nissan Altima Sedan

P0139 2008 Nissan Altima Sedan Code - HO2S12 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for a 2008 Nissan Altima Sedan refers to a slow response from the downstream oxygen sensor (HO2S12) located after the catalytic converter. Common causes include Faulty downstream oxygen sensor (HO2S12), Wiring or connector issues, 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 2008 Nissan Altima Sedan indicates HO2S12 Slow Response.
Common causes
Common causes include Faulty downstream oxygen sensor (HO2S12), Wiring or connector issues, 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 14, 2024
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Code P0139 2008 Nissan Altima Sedan Description

The P0139 diagnostic trouble code (DTC) for a 2008 Nissan Altima Sedan refers to a slow response from the downstream oxygen sensor (HO2S12) located after the catalytic converter. The oxygen sensor is responsible for measuring the oxygen content 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 and affect the engine's performance and emissions.

OBDII Code P0139 2008 Nissan Altima Sedan - HO2S12 Slow Response
P0139 2008 Nissan Altima Sedan Code - HO2S12 Slow Response

Common Causes of P0139 2008 Nissan Altima Sedan

  1. Faulty downstream oxygen sensor (HO2S12)
  2. Wiring or connector issues
  3. Exhaust leaks near the oxygen sensor
  4. Malfunctioning ECM
  5. Contaminated or damaged oxygen sensor

Symptoms of P0139 2008 Nissan Altima Sedan

  1. Check engine light illuminated
  2. Reduced fuel efficiency
  3. Engine misfires or hesitation
  4. Rough idling
  5. Failed emissions test

How to Fix P0139 2008 Nissan Altima Sedan

  1. Use an OBD-II scanner to retrieve the specific trouble code and confirm the diagnosis.
  2. Inspect the downstream oxygen sensor and wiring for any visible damage or corrosion.
  3. Test the oxygen sensor's response time using a multimeter or oscilloscope.
  4. Replace the downstream oxygen sensor if it is faulty or not responding within the specified parameters.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0139 2008 Nissan Altima Sedan

The cost of repairing a P0139 code on a 2008 Nissan Altima Sedan can vary depending on the specific cause of the issue. Generally, the cost of a new downstream oxygen sensor ranges from $50 to $200, depending on the brand and quality. Labor costs for replacing the sensor typically range from $100 to $200, with total repair costs estimated to be between $150 and $400. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P0139 2008 Nissan Altima Sedan

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 Altima Sedan Code

1. What is the meaning of OBDII code P0139 on a 2008 Nissan Altima Sedan?

Code P0139 indicates a slow response from the downstream oxygen sensor (HO2S12) in bank 1 of the exhaust system.

2. What are the common symptoms of code P0139 on a 2008 Nissan Altima Sedan?

Common symptoms include poor fuel economy, rough idling, decreased engine performance, and an illuminated check engine light.

3. What are the possible causes of OBDII code P0139 on a 2008 Nissan Altima Sedan?

Possible causes of code P0139 include a faulty oxygen sensor, wiring issues, exhaust leaks, engine misfires, or a malfunctioning catalytic converter.

4. How can I diagnose the cause of code P0139 on my 2008 Nissan Altima Sedan?

Diagnosing code P0139 typically involves inspecting the oxygen sensor, checking for wiring faults, conducting a visual inspection of the exhaust system, and performing a scan tool test.

5. Can a bad oxygen sensor cause code P0139 on a 2008 Nissan Altima Sedan?

Yes, a faulty downstream oxygen sensor (HO2S12) can trigger code P0139 due to its slow response in monitoring the exhaust gases.

6. How can I repair OBDII code P0139 on my 2008 Nissan Altima Sedan?

Repairing code P0139 may involve replacing the downstream oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, addressing engine misfires, or replacing a malfunctioning catalytic converter.

7. Is it safe to continue driving with OBDII code P0139 on a 2008 Nissan Altima Sedan?

It is generally not recommended to drive with a malfunctioning oxygen sensor, as it can lead to decreased fuel efficiency and potentially cause damage to other engine components.

8. Will resetting the check engine light resolve OBDII code P0139 on a 2008 Nissan Altima Sedan?

Simply resetting the check engine light will not fix the underlying issue causing code P0139. It is important to diagnose the problem and perform the necessary repairs.

9. How much does it cost to repair OBDII code P0139 on a 2008 Nissan Altima Sedan?

The cost of repairing code P0139 can vary depending on the underlying issue, but it may range from $100 to $500 or more, including parts and labor.

10. Can a DIY enthusiast fix OBDII code P0139 on a 2008 Nissan Altima Sedan?

While some aspects of diagnosing and repairing code P0139 can be tackled by a DIY enthusiast, it is recommended to seek professional help, especially when dealing with complex issues like sensor replacement or exhaust system repairs.

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