AutoCodes – Nissan – P0138 2008 Nissan Rogue

P0138 2008 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 2008 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 3,996

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 2008 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 2008 Nissan Rogue - HO2S12 Circuit High Voltage - AutoCodes.com — P0138 2008 Nissan Rogue Code - HO2S12 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0138 2008 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 2008 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 2008 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 2008 Nissan Rogue code?

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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 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.