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Engine-Codes – Nissan – P0139 2007 Nissan Sentra

P0139 2007 Nissan Sentra Code - HO2S12 Slow Response

Quick Answer

The diagnostic trouble code P0139 for a 2007 Nissan Sentra indicates a slow response from the HO2S12 sensor, also known as the downstream oxygen sensor located after the catalytic converter. Common causes include Faulty HO2S12 sensor, Wiring issues (shorts, open circuits), 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 2007 Nissan Sentra indicates HO2S12 Slow Response.
Common causes
Common causes include Faulty HO2S12 sensor, Wiring issues (shorts, open circuits), 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 13, 2024
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Code P0139 2007 Nissan Sentra Description

The diagnostic trouble code P0139 for a 2007 Nissan Sentra indicates a slow response from the HO2S12 sensor, also known as the downstream oxygen sensor located after the catalytic converter. This sensor is responsible for monitoring the oxygen levels 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 this sensor can lead to issues with fuel efficiency, emissions, and overall engine performance.

OBDII Code P0139 2007 Nissan Sentra - HO2S12 Slow Response
P0139 2007 Nissan Sentra Code - HO2S12 Slow Response

Common Causes of P0139 2007 Nissan Sentra

  1. Faulty HO2S12 sensor
  2. Wiring issues (shorts, open circuits)
  3. Exhaust leaks near the sensor
  4. ECM malfunction
  5. Contaminated sensor (oil, coolant, etc.)

Symptoms of P0139 2007 Nissan Sentra

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

How to Fix P0139 2007 Nissan Sentra

  1. Begin by diagnosing the specific cause of the slow response from the HO2S12 sensor using a scan tool to monitor sensor data and check for any related trouble codes.
  2. Inspect the wiring harness and connections for any damage or corrosion, repairing or replacing as needed.
  3. Check for exhaust leaks near the sensor and repair them to prevent false readings.
  4. Replace the HO2S12 sensor if it is found to be faulty or contaminated.
  5. Clear the trouble codes from the ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0139 2007 Nissan Sentra

The cost of repairing a slow response from the HO2S12 sensor in a 2007 Nissan Sentra can vary depending on the specific cause of the issue. On average, the cost of replacing an oxygen sensor ranges from $100 to $250, including parts and labor. Additional costs may apply if wiring repairs or other components need to be addressed. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific diagnosis and repair needed. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.

What does this mean?

Tech Notes for P0139 2007 Nissan Sentra

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 2007 Nissan Sentra Code

1. What does OBDII code P0139 mean on a 2007 Nissan Sentra?

- This code, HO2S12 Slow Response, indicates a slow response from the oxygen sensor 2 in bank 1 of the vehicle's exhaust system.

2. What are common symptoms of OBDII code P0139 on a 2007 Nissan Sentra?

- Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, and an illuminated check engine light.

3. What are the possible causes of OBDII code P0139 on a 2007 Nissan Sentra?

- The code P0139 on a 2007 Nissan Sentra can be triggered by issues such as a faulty oxygen sensor, wiring problems, exhaust leaks, or a damaged catalytic converter.

4. How can I diagnose the cause of OBDII code P0139 on my 2007 Nissan Sentra?

- To diagnose the issue, you can start by inspecting the oxygen sensor and its wiring for any visible damage. You can also check for exhaust leaks and perform a thorough inspection of the catalytic converter.

5. Can I still drive my 2007 Nissan Sentra with OBDII code P0139?

- It is not recommended to drive your Nissan Sentra with code P0139 for an extended period as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. How can I repair OBDII code P0139 on my 2007 Nissan Sentra?

- Repairing code P0139 may involve replacing the oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, or replacing the catalytic converter if necessary.

7. Is it safe to reset the check engine light after fixing OBDII code P0139 on a 2007 Nissan Sentra?

- Yes, once you have repaired the underlying issue causing code P0139, it is safe to reset the check engine light using an OBDII scanner to clear the code.

8. How much does it typically cost to repair OBDII code P0139 on a 2007 Nissan Sentra?

- The cost of repairing code P0139 on a 2007 Nissan Sentra can vary depending on the specific issue, but it may range from $100 to $500 or more, including parts and labor.

9. Can a DIY enthusiast fix OBDII code P0139 on a 2007 Nissan Sentra?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair code P0139 themselves by following step-by-step guides or tutorials.

10. How often does OBDII code P0139 occur in a 2007 Nissan Sentra?

- Code P0139, indicating a slow response from the HO2S12 sensor, can occur sporadically or more frequently depending on the severity of the underlying issue and driving conditions.

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