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P0139 2009 Nissan Altima Sedan Code - HO2S12 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for a 2009 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 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 2009 Nissan Altima Sedan indicates HO2S12 Slow Response.
Common causes
Common causes include Faulty downstream oxygen sensor (HO2S12), 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 17, 2024
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Code P0139 2009 Nissan Altima Sedan Description

The P0139 diagnostic trouble code (DTC) for a 2009 Nissan Altima Sedan refers to a slow response from the downstream oxygen sensor (HO2S12). The oxygen sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases, 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 incorrect fuel trim adjustments, affecting engine performance, fuel efficiency, and emissions.

OBDII Code P0139 2009 Nissan Altima Sedan - HO2S12 Slow Response
P0139 2009 Nissan Altima Sedan Code - HO2S12 Slow Response

Common Causes of P0139 2009 Nissan Altima Sedan

  1. Faulty downstream oxygen sensor (HO2S12)
  2. Wiring or connector issues in the oxygen sensor circuit
  3. Exhaust leaks near the oxygen sensor
  4. Engine coolant leaks contaminating the oxygen sensor
  5. ECM software or hardware issues

Symptoms of P0139 2009 Nissan Altima Sedan

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Engine misfires or hesitation during acceleration
  4. Rough idling or stalling
  5. Increased emissions output

How to Fix P0139 2009 Nissan Altima Sedan

  1. Begin by diagnosing the specific cause of the slow response from the downstream oxygen sensor using a scan tool to retrieve freeze frame data and live sensor data.
  2. Inspect the wiring and connectors in the oxygen sensor circuit for any damage or corrosion. Repair or replace as necessary.
  3. Check for exhaust leaks near the oxygen sensor and repair them to prevent false readings.
  4. Test the downstream oxygen sensor's response time using a multimeter or oscilloscope. Replace the sensor if it fails to respond within specifications.
  5. Clear the DTC and perform a test drive to ensure that the issue has been resolved.

Cost to Fix P0139 2009 Nissan Altima Sedan

The cost of repairing a P0139 code on a 2009 Nissan Altima Sedan can vary depending on the specific cause of the issue. In general, the price range for parts such as a downstream oxygen sensor can be between $50 and $200, while labor costs can range from $80 to $150 per hour. Overall, the total repair cost for this issue may fall between $150 and $400, but it's essential to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your location and vehicle specifics.

What does this mean?

Tech Notes for P0139 2009 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 2009 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0139 in a 2009 Nissan Altima Sedan?

- Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the check engine light.

2. What does the OBDII code P0139 for a 2009 Nissan Altima Sedan indicate?

- The code P0139 indicates that the downstream oxygen sensor (HO2S12) is experiencing a slow response time.

3. What are the possible causes of OBDII code P0139 in a 2009 Nissan Altima Sedan?

- Possible causes include a faulty oxygen sensor, wiring issues in the oxygen sensor circuit, exhaust leaks, or an engine running too rich or too lean.

4. How do I diagnose the cause of OBDII code P0139 in my 2009 Nissan Altima Sedan?

- To diagnose the issue, you can use an OBDII scanner to read the code and check the oxygen sensor's voltage readings. Additionally, inspect the sensor's wiring and the exhaust system for any leaks.

5. Can I continue driving my 2009 Nissan Altima Sedan with OBDII code P0139?

- It is not recommended to continue driving with the code P0139 as it can lead to further damage to the catalytic converter and engine components.

6. How can I repair OBDII code P0139 in my 2009 Nissan Altima Sedan?

- The repair typically involves replacing the downstream oxygen sensor (HO2S12) with a new one and ensuring that the wiring connections are secure and free of damage.

7. Are there any DIY tips for fixing OBDII code P0139 in a 2009 Nissan Altima Sedan?

- While replacing the oxygen sensor can be done as a DIY repair, it's important to have the correct tools and follow the manufacturer's instructions for proper installation.

8. How much does it cost to repair OBDII code P0139 in a 2009 Nissan Altima Sedan?

- The cost of repairing OBDII code P0139 can vary depending on the labor rates and the price of the oxygen sensor. On average, the repair can cost between $150 to $300.

9. Will resetting the check engine light resolve OBDII code P0139 in a 2009 Nissan Altima Sedan?

- Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing the code. It's important to diagnose and repair the problem to prevent further issues.

10. How often should I replace the oxygen sensors in my 2009 Nissan Altima Sedan to prevent OBDII code P0139?

- Oxygen sensors typically last around 60,000 to 90,000 miles. It's recommended to follow the manufacturer's maintenance schedule and replace them as needed to prevent issues like code P0139.

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