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Engine-Codes – Nissan – P0139 2011 Nissan Altima Sedan

P0139 2011 Nissan Altima Sedan Code - HO2S12 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for a 2011 Nissan Altima Sedan refers to a slow response from the downstream oxygen sensor (HO2S12). Common causes include Faulty downstream oxygen sensor (HO2S12), Wiring or connector issues, 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 2011 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 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 2011 Nissan Altima Sedan Description

The P0139 diagnostic trouble code (DTC) for a 2011 Nissan Altima Sedan 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 to ensure proper fuel mixture for combustion. The downstream oxygen sensor specifically measures the oxygen content after the catalytic converter.

OBDII Code P0139 2011 Nissan Altima Sedan - HO2S12 Slow Response
P0139 2011 Nissan Altima Sedan Code - HO2S12 Slow Response

Common Causes of P0139 2011 Nissan Altima Sedan

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

Symptoms of P0139 2011 Nissan Altima Sedan

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Poor acceleration or engine performance
  5. Failed emissions test

How to Fix P0139 2011 Nissan Altima Sedan

  1. Diagnose the issue using a scan tool to confirm the P0139 code and check the sensor's response time.
  2. Inspect the downstream oxygen sensor, wiring, and connectors for any visible damage or corrosion.
  3. Repair or replace the downstream oxygen sensor if it is faulty.
  4. Clear the DTC and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be needed to check for exhaust leaks or ECM malfunctions.

Cost to Fix P0139 2011 Nissan Altima Sedan

The typical repair costs for addressing a P0139 code on a 2011 Nissan Altima Sedan can range from $150 to $400, including parts and labor. However, 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 is recommended to inquire about local rates for a more accurate estimate.

What does this mean?

Tech Notes for P0139 2011 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 2011 Nissan Altima Sedan Code

1. What does the OBDII code P0139 on a 2011 Nissan Altima Sedan indicate?

The code P0139 in a 2011 Nissan Altima Sedan specifically refers to a fault with the HO2S12 sensor, indicating a slow response from the downstream oxygen sensor.

2. What are the common symptoms of a HO2S12 slow response fault in a 2011 Nissan Altima Sedan?

Common symptoms of a P0139 code in a 2011 Nissan Altima Sedan may include poor fuel economy, rough idling, hesitation during acceleration, and an illuminated check engine light.

3. What are the potential causes of a P0139 code in a 2011 Nissan Altima Sedan?

Common causes of a P0139 code in a 2011 Nissan Altima Sedan include a faulty oxygen sensor, wiring issues, exhaust leaks, or problems with the engine's air-fuel mixture.

4. How can I diagnose a P0139 code in my 2011 Nissan Altima Sedan?

Diagnosing a P0139 code in a 2011 Nissan Altima Sedan involves using an OBDII scanner to retrieve the code, inspecting the HO2S12 sensor and its wiring for damage, and checking for any exhaust leaks.

5. Can I still drive my 2011 Nissan Altima Sedan with a P0139 code?

It is not recommended to drive a 2011 Nissan Altima Sedan with a P0139 code for an extended period, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. How can I repair a P0139 code in my 2011 Nissan Altima Sedan?

Repairing a P0139 code in a 2011 Nissan Altima Sedan typically involves replacing the faulty HO2S12 sensor, repairing any wiring issues, fixing exhaust leaks, and ensuring the air-fuel mixture is correct.

7. How much does it cost to repair a P0139 code in a 2011 Nissan Altima Sedan?

The cost of repairing a P0139 code in a 2011 Nissan Altima Sedan can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor.

8. Can I reset the check engine light after fixing a P0139 code in my 2011 Nissan Altima Sedan?

Yes, you can reset the check engine light after fixing a P0139 code in a 2011 Nissan Altima Sedan using an OBDII scanner or by disconnecting the car's battery for a few minutes.

9. How often does a P0139 code occur in a 2011 Nissan Altima Sedan?

The occurrence of a P0139 code in a 2011 Nissan Altima Sedan can vary depending on the vehicle's maintenance history, driving conditions, and overall health of the engine and emission control system.

10. Is it necessary to address a P0139 code immediately in a 2011 Nissan Altima Sedan?

It is recommended to address a P0139 code in a 2011 Nissan Altima Sedan promptly to prevent further issues with fuel efficiency, engine performance, and emissions.

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