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Engine-Codes – Nissan – P0139 2010 Nissan Sentra

P0139 2010 Nissan Sentra Code - HO2S12 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for a 2010 Nissan Sentra refers to a slow response from the downstream oxygen sensor (HO2S12). Common causes include Faulty downstream oxygen sensor, Wiring issues or corrosion in the sensor circuit, 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 2010 Nissan Sentra indicates HO2S12 Slow Response.
Common causes
Common causes include Faulty downstream oxygen sensor, Wiring issues or corrosion in the sensor circuit, 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 2010 Nissan Sentra Description

The P0139 diagnostic trouble code (DTC) for a 2010 Nissan Sentra refers to a slow response from the downstream oxygen sensor (HO2S12). The downstream oxygen sensor is located after the catalytic converter and is responsible for monitoring the efficiency of the catalytic converter by measuring the oxygen content in the exhaust gases. A slow response from this sensor can indicate a problem with the sensor itself, the wiring, or the engine's air-fuel mixture.

OBDII Code P0139 2010 Nissan Sentra - HO2S12 Slow Response
P0139 2010 Nissan Sentra Code - HO2S12 Slow Response

Common Causes of P0139 2010 Nissan Sentra

  1. Faulty downstream oxygen sensor
  2. Wiring issues or corrosion in the sensor circuit
  3. Exhaust leaks near the sensor
  4. Engine running too rich or too lean
  5. Faulty ECM

Symptoms of P0139 2010 Nissan Sentra

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

How to Fix P0139 2010 Nissan Sentra

  1. Begin by diagnosing the specific cause of the slow response from the downstream oxygen sensor using a scan tool to monitor sensor data.
  2. Inspect the sensor and wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Check for exhaust leaks near the sensor and repair as needed.
  4. Perform a fuel system diagnosis to ensure the engine is running at the correct air-fuel ratio.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0139 2010 Nissan Sentra

The cost of repairing a P0139 DTC on a 2010 Nissan Sentra can vary depending on the specific cause of the issue. In general, the cost of replacing a downstream oxygen sensor can range from $100 to $300, including parts and labor. Additional costs may be incurred if wiring repairs or other diagnostics are needed. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P0139 2010 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 2010 Nissan Sentra Code

1. What is OBDII code P0139 in a 2010 Nissan Sentra?

OBDII code P0139 in a 2010 Nissan Sentra indicates a slow response from the HO2S12 sensor, also known as the downstream oxygen sensor.

2. What are the common symptoms of OBDII code P0139 in a 2010 Nissan Sentra?

Common symptoms of OBDII code P0139 in a 2010 Nissan Sentra 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 in a 2010 Nissan Sentra?

Possible causes of OBDII code P0139 in a 2010 Nissan Sentra include a faulty HO2S12 sensor, wiring issues, exhaust leaks, or a problem with the engine's air-fuel mixture.

4. How can I diagnose OBDII code P0139 in a 2010 Nissan Sentra?

Diagnosing OBDII code P0139 in a 2010 Nissan Sentra involves using an OBDII scanner to retrieve the code, inspecting the HO2S12 sensor and its wiring, checking for exhaust leaks, and verifying the engine's air-fuel mixture.

5. Can I drive my 2010 Nissan Sentra with OBDII code P0139?

It is generally not recommended to drive your 2010 Nissan Sentra with OBDII code P0139, as it can lead to poor fuel efficiency and potential damage to the catalytic converter over time.

6. How can I repair OBDII code P0139 in a 2010 Nissan Sentra?

Repairing OBDII code P0139 in a 2010 Nissan Sentra involves replacing the HO2S12 sensor if faulty, repairing any damaged wiring, fixing exhaust leaks, and addressing any issues with the engine's air-fuel mixture.

7. Is it possible to reset OBDII code P0139 in a 2010 Nissan Sentra without fixing the underlying issue?

Resetting OBDII code P0139 in a 2010 Nissan Sentra without fixing the underlying issue will only temporarily turn off the check engine light, as the code will reappear once the system detects the same problem again.

8. How much does it cost to fix OBDII code P0139 in a 2010 Nissan Sentra?

The cost to fix OBDII code P0139 in a 2010 Nissan Sentra can vary depending on the specific issue causing the code, but it may range from $100 to $300 or more, including parts and labor.

9. Can a DIY enthusiast repair OBDII code P0139 in a 2010 Nissan Sentra?

A DIY enthusiast with automotive repair experience may be able to repair OBDII code P0139 in a 2010 Nissan Sentra by following the proper diagnostic procedures and replacing the faulty components themselves.

10. How often does OBDII code P0139 occur in a 2010 Nissan Sentra?

OBDII code P0139 in a 2010 Nissan Sentra can occur due to various factors, such as sensor degradation or wiring issues, so it is not uncommon for this code to appear sporadically during the vehicle's lifetime.

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