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P0139 2003 Nissan Altima Sedan Code - HO2S12 Slow Response

Quick Answer

The P0139 diagnostic trouble code (DTC) for a 2003 Nissan Altima Sedan refers to a slow response from the downstream oxygen sensor (HO2S12). Common causes include Faulty downstream oxygen sensor, Wiring or connector issues, Exhaust leaks. 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 2003 Nissan Altima Sedan indicates HO2S12 Slow Response.
Common causes
Common causes include Faulty downstream oxygen sensor, Wiring or connector issues, Exhaust leaks.
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 2003 Nissan Altima Sedan Description

The P0139 diagnostic trouble code (DTC) for a 2003 Nissan Altima Sedan 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 issues with the catalytic converter, fuel system, or exhaust system, affecting the vehicle's performance and emissions.

OBDII Code P0139 2003 Nissan Altima Sedan - HO2S12 Slow Response
P0139 2003 Nissan Altima Sedan Code - HO2S12 Slow Response

Common Causes of P0139 2003 Nissan Altima Sedan

  1. Faulty downstream oxygen sensor
  2. Wiring or connector issues
  3. Exhaust leaks
  4. Malfunctioning catalytic converter
  5. Fuel system problems

Symptoms of P0139 2003 Nissan Altima Sedan

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling
  4. Illuminated check engine light
  5. Failed emissions test

How to Fix P0139 2003 Nissan Altima Sedan

  1. Use an OBD-II scanner to confirm the P0139 code and identify the specific issue.
  2. Inspect the downstream oxygen sensor, wiring, and connectors for any damage or corrosion.
  3. Check for exhaust leaks and repair or replace any damaged components.
  4. Test the catalytic converter for proper function and replace if necessary.
  5. Verify the fuel system components for any issues and address as needed.

Cost to Fix P0139 2003 Nissan Altima Sedan

The typical repair costs for addressing a P0139 code on a 2003 Nissan Altima Sedan can range from $150 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices. For a more accurate estimate, it is recommended to consult local auto repair shops.

What does this mean?

Tech Notes for P0139 2003 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 2003 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0139 (HO2S12 Slow Response) in a 2003 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 HO2S12 Slow Response code indicate in a 2003 Nissan Altima Sedan?

- This code indicates that the downstream oxygen sensor (HO2S12) is not responding quickly enough to changes in the exhaust gas oxygen levels.

3. What are the possible causes of OBDII code P0139 in a 2003 Nissan Altima Sedan?

- The possible causes include a faulty oxygen sensor, wiring issues, exhaust leaks, engine misfires, or a malfunctioning catalytic converter.

4. How can I diagnose the HO2S12 Slow Response code in my 2003 Nissan Altima Sedan?

- A diagnostic scan tool can help identify the specific cause of the code by monitoring the oxygen sensor's response time and checking for any related trouble codes.

5. Can I continue driving my 2003 Nissan Altima Sedan with OBDII code P0139 (HO2S12 Slow Response)?

- It is generally safe to drive the vehicle for a short period with this code, but it is recommended to address the issue promptly to avoid potential damage to the engine or catalytic converter.

6. Is it possible to repair OBDII code P0139 in a 2003 Nissan Altima Sedan myself?

- Depending on your mechanical skills and tools available, you may be able to replace the oxygen sensor or fix wiring issues yourself. However, more complex issues may require professional assistance.

7. How much does it typically cost to repair OBDII code P0139 in a 2003 Nissan Altima Sedan?

- The cost of repairing this code can vary depending on the underlying cause. Replacing an oxygen sensor can range from $100 to $300, while addressing issues with the catalytic converter or wiring may be more expensive.

8. Can a dirty or contaminated oxygen sensor trigger the HO2S12 Slow Response code in a 2003 Nissan Altima Sedan?

- Yes, a dirty or contaminated oxygen sensor can lead to slow response times and trigger this code. Cleaning the sensor may resolve the issue, but replacement is often recommended for long-term reliability.

9. Will resetting the Check Engine Light make OBDII code P0139 disappear in a 2003 Nissan Altima Sedan?

- Resetting the Check Engine Light may temporarily turn it off, but the underlying issue causing the code will likely persist. It is important to diagnose and repair the problem to prevent future occurrences.

10. How long does it typically take to repair OBDII code P0139 (HO2S12 Slow Response) in a 2003 Nissan Altima Sedan?

- The repair time can vary based on the cause of the code and the availability of parts. Simple fixes like replacing the oxygen sensor may take an hour or two, while more complex issues could require a day or more at a repair shop.

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