AutoCodes – Nissan – P0138 2012 Nissan Rogue

P0138 2012 Nissan Rogue Code - HO2S12 Circuit High Voltage

Quick Answer

The Heated Oxygen Sensor 2 (HO2S) (Rear O2 Sensor), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection. 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 2012 Nissan Rogue indicates HO2S12 Circuit High Voltage.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection.
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.

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Code Popularity 2,834

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 14, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0138 2012 Nissan Rogue Description

The Heated Oxygen Sensor 2 (HO2S) (Rear O2 Sensor), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0138 2012 Nissan Rogue - HO2S12 Circuit High Voltage - AutoCodes.com — P0138 2012 Nissan Rogue Code - HO2S12 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0138 2012 Nissan Rogue?

Faulty Rear Heated Oxygen Sensor Bank 1
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Intake air leaks
Exhaust gas leaks
Inappropriate fuel pressure
Faulty fuel injectors

How to Fix the DTC P0138 2012 Nissan Rogue?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0138 2012 Nissan Rogue code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0138 2012 Nissan Rogue code?

Need more information on how to fix the P0138 2012 Nissan Rogue code? Get Access to Factory Service Manuals

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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 2012 Nissan Rogue Code

1. What does OBDII code P0138 on a 2012 Nissan Rogue mean?

This code indicates a high voltage condition in the HO2S12 (Heated Oxygen Sensor 1 Bank 1 Sensor 2) circuit.

2. What are the common symptoms of OBDII code P0138 on a 2012 Nissan Rogue?

Common symptoms include reduced fuel efficiency, engine hesitation, rough idling, and an illuminated check engine light.

3. What are the possible causes of OBDII code P0138 on a 2012 Nissan Rogue?

Potential causes include a faulty HO2S12 sensor, wiring issues in the sensor circuit, a damaged sensor connector, or an exhaust leak near the sensor.

4. How can I diagnose the issue related to OBDII code P0138 on a 2012 Nissan Rogue?

Diagnosis typically involves checking the sensor's wiring and connector for damage, testing the sensor's voltage output, and inspecting the exhaust system for leaks.

5. Can I continue driving my 2012 Nissan Rogue with OBDII code P0138?

It is not recommended to drive the vehicle for an extended period with this code as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. How can I repair OBDII code P0138 on a 2012 Nissan Rogue?

Repair options may include replacing the HO2S12 sensor, repairing damaged wiring or connectors, fixing any exhaust leaks, and clearing the trouble code with an OBDII scanner.

7. How much does it cost to fix OBDII code P0138 on a 2012 Nissan Rogue?

The cost of repairs can vary depending on the specific issue causing the code, but it typically ranges from $100 to $300 for parts and labor.

8. How long does it take to repair OBDII code P0138 on a 2012 Nissan Rogue?

The repair time can vary based on the exact cause of the code, but it generally takes around 1-2 hours for a mechanic to diagnose and fix the issue.

9. Is it possible to prevent OBDII code P0138 from occurring again on a 2012 Nissan Rogue?

Regular maintenance, such as inspecting and replacing sensors as needed, checking for exhaust leaks, and addressing any wiring issues promptly, can help prevent the recurrence of this code.

10. Can I reset the OBDII code P0138 on a 2012 Nissan Rogue without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it is crucial to address the root cause of the problem to prevent further issues and ensure optimal vehicle performance.