Engine-Codes.com
Engine-Codes – Nissan – P0138 2006 Nissan Altima Sedan

P0138 2006 Nissan Altima Sedan Code - HO2S12 Circuit High Voltage

Quick Answer

The P0138 diagnostic trouble code (DTC) for a 2006 Nissan Altima Sedan refers to an issue with the HO2S12 sensor circuit, indicating that the oxygen sensor located after the catalytic converter in bank 1 sensor 2 is detecting a high voltage condition. Common causes include Faulty oxygen sensor (HO2S12), Wiring issues or shorts 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 2006 Nissan Altima Sedan indicates HO2S12 Circuit High Voltage.
Common causes
Common causes include Faulty oxygen sensor (HO2S12), Wiring issues or shorts 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 17, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0138 2006 Nissan Altima Sedan Description

The P0138 diagnostic trouble code (DTC) for a 2006 Nissan Altima Sedan refers to an issue with the HO2S12 sensor circuit, indicating that the oxygen sensor located after the catalytic converter in bank 1 sensor 2 is detecting a high voltage condition. 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. When the voltage detected by the sensor is higher than expected, it can lead to various performance issues in the vehicle.

OBDII Code P0138 2006 Nissan Altima Sedan - HO2S12 Circuit High Voltage
P0138 2006 Nissan Altima Sedan Code - HO2S12 Circuit High Voltage

Common Causes of P0138 2006 Nissan Altima Sedan

  1. Faulty oxygen sensor (HO2S12)
  2. Wiring issues or shorts in the sensor circuit
  3. Exhaust leaks near the sensor
  4. ECM malfunction
  5. Fuel system issues affecting air-fuel mixture

Symptoms of P0138 2006 Nissan Altima Sedan

  1. Decreased fuel efficiency
  2. Check Engine Light illuminated
  3. Rough idling or engine misfires
  4. Reduced engine performance
  5. Increased emissions

How to Fix P0138 2006 Nissan Altima Sedan

  1. Begin by conducting a thorough inspection of the oxygen sensor and its wiring for any visible damage or corrosion.
  2. Use a multimeter to test the voltage output of the oxygen sensor to determine if it is within the specified range.
  3. If the sensor is faulty, replace it with a new OEM or high-quality aftermarket sensor.
  4. Check and repair any damaged wiring or connections in the sensor circuit.
  5. Clear the DTC using a scan tool and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0138 2006 Nissan Altima Sedan

The cost of repairing a P0138 DTC on a 2006 Nissan Altima Sedan can vary depending on the specific cause of the issue. Typically, the cost of a new oxygen sensor can range from $50 to $200, while labor costs for diagnosis and replacement can range from $100 to $300. Overall, the total repair cost could range from $150 to $500. It is advisable to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your location and vehicle specifics. Labor rates at auto repair shops can vary, so it's essential to inquire about pricing before proceeding with the repair.

What does this mean?

Tech Notes for P0138 2006 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.

Need more information about the P0138 2006 Nissan Altima Sedan code?

Need more information on how to fix the P0138 2006 Nissan Altima Sedan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0138 2006 Nissan Altima Sedan code diagnosed by a professional: Find a repair shop in your area

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 2006 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0138 in a 2006 Nissan Altima Sedan?

- Common symptoms include poor fuel economy, rough idling, and possible stalling of the vehicle.

2. What does the HO2S12 Circuit High Voltage error code mean for a 2006 Nissan Altima Sedan?

- This code indicates that the oxygen sensor (HO2S12) in bank 1 sensor 2 is registering a high voltage condition.

3. What are the possible causes of the P0138 code in a 2006 Nissan Altima Sedan?

- The code can be triggered by issues such as a faulty oxygen sensor, a wiring problem in the sensor circuit, or an engine running too rich.

4. How can I diagnose the HO2S12 Circuit High Voltage error code in my 2006 Nissan Altima Sedan?

- To diagnose this code, you may need to inspect the oxygen sensor, check the sensor's wiring and connections, and perform a scan tool test to monitor sensor data.

5. Can a dirty or contaminated oxygen sensor cause the P0138 code in a 2006 Nissan Altima Sedan?

- Yes, a dirty or contaminated oxygen sensor can lead to improper readings and trigger the high voltage error code.

6. Is it safe to continue driving my 2006 Nissan Altima Sedan with the P0138 code present?

- It is not recommended to drive the vehicle with the P0138 code active, as it can lead to poor engine performance and potential damage over time.

7. How can I reset the OBDII code P0138 in my 2006 Nissan Altima Sedan after making repairs?

- You can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the error code.

8. What are some repair tips for fixing the HO2S12 Circuit High Voltage issue in a 2006 Nissan Altima Sedan?

- Repair tips include replacing the faulty oxygen sensor, checking and repairing any damaged wiring, and ensuring proper sensor connections.

9. Will replacing the oxygen sensor fix the P0138 code in my 2006 Nissan Altima Sedan?

- In many cases, replacing the oxygen sensor responsible for the high voltage condition can resolve the P0138 code issue.

10. How can I prevent the OBDII code P0138 from recurring in my 2006 Nissan Altima Sedan?

- To prevent the P0138 code from coming back, it's essential to perform regular maintenance, use quality fuel, and address any engine issues promptly.

Discuss the causes and fixes for P0138 2006 Nissan Altima Sedan OBDII Code

Submit a New Comment

Code P0138 2006 Nissan Altima Sedan comments

No comments found for this page.