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P0138 2007 Nissan Pathfinder Code - HO2S12 Circuit High Voltage

Quick Answer

The P0138 diagnostic trouble code (DTC) in a 2007 Nissan Pathfinder indicates a problem with the HO2S12 (Heated Oxygen Sensor 1 Bank 1 Sensor 2) circuit having a high voltage. Common causes include Faulty HO2S12 sensor, Wiring or connector issues in the sensor circuit, Vacuum leaks in the intake system. 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 2007 Nissan Pathfinder indicates HO2S12 Circuit High Voltage.
Common causes
Common causes include Faulty HO2S12 sensor, Wiring or connector issues in the sensor circuit, Vacuum leaks in the intake system.
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 11, 2024
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Code P0138 2007 Nissan Pathfinder Description

The P0138 diagnostic trouble code (DTC) in a 2007 Nissan Pathfinder indicates a problem with the HO2S12 (Heated Oxygen Sensor 1 Bank 1 Sensor 2) circuit having a high voltage. This sensor is responsible for monitoring the oxygen content in the exhaust gases to ensure optimal fuel efficiency and emissions control. When the voltage detected by the sensor is higher than expected, it can lead to various issues with the vehicle's performance and emissions.

OBDII Code P0138 2007 Nissan Pathfinder - HO2S12 Circuit High Voltage
P0138 2007 Nissan Pathfinder Code - HO2S12 Circuit High Voltage

Common Causes of P0138 2007 Nissan Pathfinder

  1. Faulty HO2S12 sensor
  2. Wiring or connector issues in the sensor circuit
  3. Vacuum leaks in the intake system
  4. Fuel delivery system problems
  5. Exhaust leaks near the sensor

Symptoms of P0138 2007 Nissan Pathfinder

  1. Decreased fuel efficiency
  2. Engine hesitation or misfiring
  3. Check Engine Light illuminated on the dashboard
  4. Rough idling or stalling
  5. Increased emissions

How to Fix P0138 2007 Nissan Pathfinder

  1. Begin by conducting a visual inspection of the sensor, wiring, and connectors to check for any visible damage or corrosion.
  2. Use a multimeter to test the voltage output of the sensor to determine if it is functioning within the expected 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 connectors in the sensor circuit.
  5. Clear the DTC from the vehicle's computer using a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0138 2007 Nissan Pathfinder

The cost of repairing a P0138 DTC in a 2007 Nissan Pathfinder can vary depending on the specific cause of the issue. On average, you can expect to pay between $100 to $300 for a new oxygen sensor, plus additional costs for labor if you choose to have a professional mechanic perform the repair. Overall, the total repair cost, including parts and labor, may range from $150 to $500. However, it's important to note that prices can vary significantly based on factors such as location, shop rates, and the quality of parts used. It's recommended to obtain quotes from multiple repair shops to ensure you get the best deal.

What does this mean?

Tech Notes for P0138 2007 Nissan Pathfinder

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 2007 Nissan Pathfinder Code

1. What does the OBDII code P0138 for a 2007 Nissan Pathfinder indicate?

The code P0138 refers to the HO2S12 (Heated Oxygen Sensor 1, Bank 1 Sensor 2) Circuit High Voltage.

2. What are the common symptoms of a P0138 code on a 2007 Nissan Pathfinder?

Common symptoms include poor fuel economy, rough idling, engine stalling, and the illuminated Check Engine Light on the dashboard.

3. What are the possible causes of a P0138 code on a 2007 Nissan Pathfinder?

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

4. How serious is a P0138 code on a 2007 Nissan Pathfinder?

While your vehicle may still be driveable with a P0138 code, it is essential to address it promptly to prevent further damage to the engine and emission control system.

5. How can I diagnose a P0138 code on my 2007 Nissan Pathfinder?

Diagnosis typically involves inspecting the HO2S12 sensor and its wiring for any visible damage, testing the sensor's voltage output, and checking for exhaust leaks near the sensor.

6. Can I drive my 2007 Nissan Pathfinder with a P0138 code?

It is generally not recommended to drive your vehicle extensively with a P0138 code, as it can lead to decreased fuel efficiency and potential damage to the engine over time.

7. How can I repair a P0138 code on a 2007 Nissan Pathfinder?

Repair options may include replacing the HO2S12 sensor, repairing any damaged wiring, fixing exhaust leaks, or addressing issues with the fuel system.

8. Will a P0138 code on a 2007 Nissan Pathfinder affect emissions?

Yes, a P0138 code can impact the emissions output of your vehicle, potentially causing it to fail emissions tests in some regions.

9. How much does it cost to fix a P0138 code on a 2007 Nissan Pathfinder?

The cost of repairing a P0138 code can vary depending on the specific issue causing the code, but it may range from $100 to $300 for parts and labor.

10. Can I reset the Check Engine Light after fixing a P0138 code on my 2007 Nissan Pathfinder?

Yes, once the underlying issue triggering the P0138 code is resolved, you can reset the Check Engine Light using an OBDII scanner or by disconnecting the car's battery for a few minutes.

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