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Engine-Codes – Nissan – P0138 2010 Nissan Altima Sedan

P0138 2010 Nissan Altima Sedan Code - HO2S12 Circuit High Voltage

Quick Answer

The P0138 code for a 2010 Nissan Altima Sedan indicates that the HO2S12 (Heated Oxygen Sensor 1 Sensor 2) circuit is registering a high voltage reading. Common causes include Faulty HO2S12 sensor, Wiring or connector issues 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
P0138 2010 Nissan Altima Sedan indicates HO2S12 Circuit High Voltage.
Common causes
Common causes include Faulty HO2S12 sensor, Wiring or connector issues 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 06, 2024
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Code P0138 2010 Nissan Altima Sedan Description

The P0138 code for a 2010 Nissan Altima Sedan indicates that the HO2S12 (Heated Oxygen Sensor 1 Sensor 2) circuit is registering a high voltage reading. This sensor is responsible for measuring the oxygen content in the exhaust gases and providing feedback to the engine control module to optimize fuel delivery. A high voltage reading suggests that the sensor is detecting an excessively rich fuel mixture in the exhaust, which can lead to decreased fuel efficiency, increased emissions, and potential damage to the catalytic converter over time. This issue can also cause the vehicle to run rough, hesitate during acceleration, or even stall.

OBDII Code P0138 2010 Nissan Altima Sedan - HO2S12 Circuit High Voltage
P0138 2010 Nissan Altima Sedan Code - HO2S12 Circuit High Voltage

Common Causes of P0138 2010 Nissan Altima Sedan

  1. Faulty HO2S12 sensor
  2. Wiring or connector issues in the sensor circuit
  3. Exhaust leaks near the sensor
  4. Engine running too rich
  5. Faulty engine control module

Symptoms of P0138 2010 Nissan Altima Sedan

  1. Decreased fuel efficiency
  2. Rough idling or running
  3. Hesitation during acceleration
  4. Check Engine Light illuminated
  5. Potential stalling

How to Fix P0138 2010 Nissan Altima Sedan

  1. Diagnose the issue using a scan tool to confirm the P0138 code and check the sensor's voltage readings.
  2. Inspect the sensor wiring and connectors for any damage or corrosion. Repair or replace as necessary.
  3. Check for exhaust leaks near the sensor and repair them.
  4. Test the HO2S12 sensor for proper operation or replace it if needed.
  5. Clear the trouble code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0138 2010 Nissan Altima Sedan

The cost of repairing a P0138 code on a 2010 Nissan Altima Sedan can vary depending on the specific cause of the issue. In general, the cost of replacing an oxygen sensor can range from $100 to $300, including parts and labor. Additional costs may apply if wiring repairs or other components need to be replaced. It's recommended to get a detailed quote from a trusted auto repair shop to determine the exact cost for your vehicle.

What does this mean?

Tech Notes for P0138 2010 Nissan Altima Sedan

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

When is the Code Detected?

The P0138 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage remains excessively high for an extended period of 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 P0138 2010 Nissan Altima Sedan Code

1. What does OBDII code P0138 for a 2010 Nissan Altima Sedan indicate?

The code P0138 on a 2010 Nissan Altima Sedan specifically refers to a fault in the HO2S12 (Heated Oxygen Sensor 1 Bank 1 Sensor 2) circuit, indicating high voltage.

2. What are the common symptoms of OBDII code P0138 on a 2010 Nissan Altima?

Common symptoms of code P0138 in a 2010 Nissan Altima Sedan may include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

3. What are the potential causes of the HO2S12 Circuit High Voltage code on a 2010 Nissan Altima?

Common causes of the P0138 code in a 2010 Nissan Altima Sedan include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, exhaust leaks, or issues with the engine's fuel management system.

4. How can I diagnose the OBDII code P0138 on my 2010 Nissan Altima Sedan?

To diagnose the P0138 code on a 2010 Nissan Altima Sedan, you may need to use an OBDII scanner to retrieve the code and then inspect the oxygen sensor, wiring, and connectors for any visible damage or issues.

5. Can I still drive my 2010 Nissan Altima Sedan with the P0138 code?

While it may be possible to drive your 2010 Nissan Altima Sedan with the P0138 code, it is recommended to address the issue promptly to prevent potential damage to the engine and ensure optimal performance.

6. How do I repair the HO2S12 Circuit High Voltage code on my 2010 Nissan Altima?

Repairing the P0138 code on a 2010 Nissan Altima Sedan typically involves replacing the faulty oxygen sensor, repairing any damaged wiring or connectors, fixing exhaust leaks, or addressing issues with the fuel management system.

7. Are there any DIY tips for fixing the P0138 code on a 2010 Nissan Altima Sedan?

While some aspects of diagnosing and repairing the P0138 code may be DIY-friendly, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure the issue is resolved effectively.

8. How much does it cost to fix the OBDII code P0138 on a 2010 Nissan Altima Sedan?

The cost of fixing the P0138 code on a 2010 Nissan Altima Sedan can vary depending on the exact cause of the issue, but it may range from a few hundred dollars to over a thousand dollars, including parts and labor.

9. Will resetting the Check Engine Light clear the P0138 code on my 2010 Nissan Altima Sedan?

Simply resetting the Check Engine Light may temporarily clear the P0138 code, but if the underlying issue causing the code is not addressed, the light is likely to reappear once the problem is detected again.

10. How can I prevent the OBDII code P0138 from recurring on my 2010 Nissan Altima Sedan?

To prevent the P0138 code from recurring on your 2010 Nissan Altima Sedan, it is essential to perform regular maintenance, address any engine-related issues promptly, and ensure the oxygen sensors and related components are in good working condition.

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