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Engine-Codes – Infiniti – P0038 Infiniti

P0038 Infiniti Code - HO2S12 Heater Control Circuit High

Quick Answer

The P0038 diagnostic trouble code (DTC) for Infiniti vehicles refers to an issue with the HO2S12 (Heated Oxygen Sensor 1 Bank 1) heater control circuit being detected as too high. Common causes include Faulty HO2S12 heater element, Wiring or connector issues in the HO2S12 heater circuit, ECM software or hardware problems. 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
P0038 Infiniti indicates HO2S12 Heater Control Circuit High.
Common causes
Common causes include Faulty HO2S12 heater element, Wiring or connector issues in the HO2S12 heater circuit, ECM software or hardware problems.
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 12, 2024
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Code P0038 Infiniti Description

The P0038 diagnostic trouble code (DTC) for Infiniti vehicles refers to an issue with the HO2S12 (Heated Oxygen Sensor 1 Bank 1) heater control circuit being detected as too high. This code indicates that there is a problem with the electrical circuit that controls the heating element in the oxygen sensor located downstream of the catalytic converter on bank 1 of the engine. The heating element in the oxygen sensor is essential for accurate and efficient operation, especially during cold start conditions when the engine needs to reach operating temperature quickly.

OBDII Code P0038 Infiniti - HO2S12 Heater Control Circuit High
P0038 Infiniti Code - HO2S12 Heater Control Circuit High

Common Causes of P0038 Infiniti

  1. Faulty HO2S12 heater element.
  2. Wiring or connector issues in the HO2S12 heater circuit.
  3. ECM software or hardware problems.
  4. Blown fuse related to the HO2S12 heater circuit.
  5. Exhaust leaks near the oxygen sensor.

Symptoms of P0038 Infiniti

  1. Check Engine Light illuminated on the dashboard.
  2. Decreased fuel efficiency.
  3. Rough idle or stalling.
  4. Engine misfires.
  5. Failed emissions test.

How to Fix P0038 Infiniti

  1. Begin by verifying the P0038 code with a diagnostic scan tool.
  2. Inspect the wiring and connectors related to the HO2S12 heater circuit for any damage or corrosion. Repair or replace as needed.
  3. Test the HO2S12 heater element for proper resistance and functionality. Replace if faulty.
  4. Check the fuse associated with the HO2S12 heater circuit and replace if blown.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0038 Infiniti

The typical cost to repair a P0038 code on an Infiniti vehicle can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Factors such as location, vehicle make and model, and engine type can also influence repair costs. For a more accurate estimate, it is recommended to consult with local auto repair shops.

When is the Code Detected?

The P0038 is set when the ECM detects an excessively high voltage through the heated oxygen sensor heater circuit

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Information for Specific Infiniti Models

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 P0038 Infiniti Code

1. What does the OBDII code P0038 for an Infiniti mean?

The code P0038 on an Infiniti indicates a problem with the HO2S12 (Heated Oxygen Sensor Bank 1 Sensor 2) heater control circuit being detected as high.

2. What are the common symptoms of OBDII code P0038 in an Infiniti?

Common symptoms of code P0038 in an Infiniti may include poor fuel economy, rough idling, stalling, or even a check engine light illuminating on the dashboard.

3. What are the potential causes of OBDII code P0038 in an Infiniti?

Possible causes of code P0038 in an Infiniti include a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or issues with the engine control module.

4. How can I diagnose the OBDII code P0038 in my Infiniti?

To diagnose code P0038 in an Infiniti, you can use an OBDII scanner to read the code, visually inspect the sensor and its connections, check the heater circuit for continuity, and test the sensor's resistance.

5. Can I drive my Infiniti with the OBDII code P0038?

It is not recommended to drive your Infiniti with the OBDII code P0038 as it can lead to poor engine performance and potentially cause damage to other components.

6. How do I repair OBDII code P0038 on my Infiniti?

Repairing code P0038 on an Infiniti may involve replacing the HO2S12 sensor, repairing damaged wiring or connectors, checking and replacing any blown fuses, or reprogramming the engine control module.

7. Is it possible to reset the OBDII code P0038 without fixing the issue on an Infiniti?

While you can clear the code using an OBDII scanner, it is not recommended to reset the code without addressing the underlying issue, as it may lead to recurring problems.

8. How much does it cost to fix OBDII code P0038 in an Infiniti?

The cost of fixing code P0038 on an Infiniti can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast repair OBDII code P0038 in an Infiniti?

If you have the necessary tools and experience working on vehicles, you may be able to repair code P0038 on your Infiniti yourself by following detailed repair guides or consulting with a mechanic for guidance.

10. How often does OBDII code P0038 occur in Infiniti vehicles?

Code P0038 related to the HO2S12 heater control circuit high can occur in Infiniti vehicles, especially in older models or those with high mileage, due to sensor wear and tear or electrical issues.

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