Engine-Codes.com
Engine-Codes – Nissan – P0138 2008 Nissan Rogue

P0138 2008 Nissan Rogue Code - HO2S12 Circuit High Voltage

Quick Answer

The P0138 code for a 2008 Nissan Rogue indicates an issue with the HO2S12 sensor circuit, specifically detecting high voltage. Common causes include Faulty HO2S12 sensor, Wiring issues such as shorts or 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
P0138 2008 Nissan Rogue indicates HO2S12 Circuit High Voltage.
Common causes
Common causes include Faulty HO2S12 sensor, Wiring issues such as shorts or 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
💬 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 2008 Nissan Rogue Description

The P0138 code for a 2008 Nissan Rogue indicates an issue with the HO2S12 sensor circuit, specifically detecting high voltage. The HO2S12 sensor, also known as the downstream oxygen sensor, plays a crucial role in monitoring the oxygen levels in the exhaust gases. This information is essential for the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion efficiency.

OBDII Code P0138 2008 Nissan Rogue - HO2S12 Circuit High Voltage
P0138 2008 Nissan Rogue Code - HO2S12 Circuit High Voltage

Common Causes of P0138 2008 Nissan Rogue

  1. Faulty HO2S12 sensor
  2. Wiring issues such as shorts or open circuits
  3. Exhaust leaks near the sensor
  4. Engine misfires
  5. ECM software issues

Symptoms of P0138 2008 Nissan Rogue

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

How to Fix P0138 2008 Nissan Rogue

  1. Begin by conducting a visual inspection of the HO2S12 sensor and its wiring for any visible damage or corrosion.
  2. Use a multimeter to test the sensor's voltage output and resistance to determine if it is functioning within specifications.
  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 connectors associated with the sensor.
  5. Clear the diagnostic trouble codes with a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0138 2008 Nissan Rogue

The cost of repairing a P0138 code on a 2008 Nissan Rogue can vary depending on the root cause of the issue. Typically, the cost of a new downstream oxygen sensor ranges from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost can range from $150 to $500. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources to ensure a competitive price.

What does this mean?

Tech Notes for P0138 2008 Nissan Rogue

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 2008 Nissan Rogue code?

Need more information on how to fix the P0138 2008 Nissan Rogue code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0138 2008 Nissan Rogue 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 2008 Nissan Rogue Code

1. What are the common symptoms of OBDII code P0138 in a 2008 Nissan Rogue?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

2. What does the HO2S12 Circuit High Voltage code (P0138) for a 2008 Nissan Rogue indicate?

- This code indicates that the downstream oxygen sensor (HO2S12) is detecting a high voltage condition, typically caused by an issue with the oxygen sensor or its circuit.

3. What are the possible causes of the P0138 code in a 2008 Nissan Rogue?

- Possible causes include a faulty oxygen sensor, wiring issues in the HO2S12 circuit, exhaust leaks near the sensor, or a problem with the engine's air-fuel mixture.

4. How serious is the P0138 code in a 2008 Nissan Rogue?

- While the vehicle may still be drivable with this code, it is important to address it promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

5. Can I drive my 2008 Nissan Rogue with the P0138 code present?

- It is generally safe to drive the vehicle in the short term, but it is recommended to have the issue diagnosed and repaired as soon as possible to avoid potential long-term damage and decreased fuel efficiency.

6. How can I diagnose and repair the P0138 code in my 2008 Nissan Rogue?

- Diagnosis typically involves checking the oxygen sensor's voltage output, inspecting the wiring harness for any damage, and testing the sensor's heater circuit. Repair may involve replacing the oxygen sensor or repairing any wiring issues.

7. Will resetting the Check Engine Light resolve the P0138 code in my 2008 Nissan Rogue?

- Resetting the Check Engine Light may temporarily turn it off, but it will not fix the underlying issue causing the P0138 code. It is important to diagnose and repair the problem to prevent it from recurring.

8. How much does it cost to fix the P0138 code in a 2008 Nissan Rogue?

- The cost of fixing the P0138 code can vary depending on the exact cause of the issue. It may involve replacing the oxygen sensor, repairing wiring, or addressing other related problems. Costs can range from $100 to $500 or more.

9. Can a DIY enthusiast fix the P0138 code in a 2008 Nissan Rogue?

- While some experienced DIYers may be able to diagnose and replace the oxygen sensor themselves, it is recommended to have a professional mechanic perform the diagnosis and repair to ensure the problem is properly addressed.

10. How often does the P0138 code occur in a 2008 Nissan Rogue?

- The occurrence of the P0138 code can vary depending on factors such as driving conditions, maintenance history, and the overall health of the vehicle. Regular maintenance and prompt attention to any Check Engine Light warnings can help prevent this code from occurring frequently.

Discuss the causes and fixes for P0138 2008 Nissan Rogue OBDII Code

Submit a New Comment

Code P0138 2008 Nissan Rogue comments

No comments found for this page.