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Engine-Codes – Infiniti – P0037 Infiniti

P0037 Infiniti Code - HO2S12 Heater Control Circuit Low

Quick Answer

The P0037 Infiniti code refers to the HO2S12 (Heated Oxygen Sensor 1 Bank 1) heater control circuit being low. Common causes include Faulty HO2S12 (Heated Oxygen Sensor 1 Bank 1), Damaged wiring or connectors in the heater circuit, Blown fuse related to the oxygen sensor heater circuit. 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
P0037 Infiniti indicates HO2S12 Heater Control Circuit Low.
Common causes
Common causes include Faulty HO2S12 (Heated Oxygen Sensor 1 Bank 1), Damaged wiring or connectors in the heater circuit, Blown fuse related to the oxygen sensor heater circuit.
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 08, 2024
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Code P0037 Infiniti Description

The P0037 Infiniti code refers to the HO2S12 (Heated Oxygen Sensor 1 Bank 1) heater control circuit being low. This means that the oxygen sensor located in the exhaust system before the catalytic converter is not heating up properly or is not reaching the desired temperature. The oxygen sensor plays a crucial role in monitoring the air-fuel ratio in the exhaust gases and helps the engine control module (ECM) adjust the fuel mixture for optimal performance and emissions.

OBDII Code P0037 Infiniti - HO2S12 Heater Control Circuit Low
P0037 Infiniti Code - HO2S12 Heater Control Circuit Low

Common Causes of P0037 Infiniti

  1. Faulty HO2S12 (Heated Oxygen Sensor 1 Bank 1)
  2. Damaged wiring or connectors in the heater circuit
  3. Blown fuse related to the oxygen sensor heater circuit
  4. Issues with the engine control module (ECM)
  5. Exhaust leaks affecting the oxygen sensor

Symptoms of P0037 Infiniti

  1. Decreased fuel efficiency
  2. Rough idling
  3. Hesitation or lack of power during acceleration
  4. Illuminated check engine light
  5. Failed emissions test

How to Fix P0037 Infiniti

  1. Diagnose the issue by using a scan tool to retrieve the code and check the oxygen sensor's heater circuit for proper voltage and resistance.
  2. Inspect the wiring and connectors for any damage or corrosion. Repair or replace as needed.
  3. Check and replace the fuse if it is blown.
  4. Test the oxygen sensor's heater circuit with a multimeter to ensure proper functionality.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0037 Infiniti

The cost of repairing a P0037 Infiniti code can vary depending on the cause of the issue and the specific parts needed for the repair. On average, the cost of replacing a faulty oxygen sensor can range from $150 to $400, including parts and labor. However, if the issue is related to wiring or fuse problems, the cost may be lower. It is recommended to consult with a professional mechanic or auto repair shop for a more accurate estimate based on the specific diagnosis and repair required. Keep in mind that labor rates can vary, so it's advisable to inquire about local rates before proceeding with the repair.

What does this mean?

Tech Notes for P0037 Infiniti

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.

When is the Code Detected?

The P0037 is set when the ECM detects an excessively low 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 P0037 Infiniti Code

1. What does the OBDII code P0037 mean on an Infiniti?

P0037 indicates a problem with the heater control circuit for the downstream oxygen sensor (HO2S12), specifically that the voltage is lower than expected.

2. What causes the P0037 code on an Infiniti?

Common causes include a faulty oxygen sensor, damaged wiring or connectors in the sensor's circuit, a blown fuse, or a malfunctioning engine control module (ECM).

3. What are the symptoms of the P0037 code on an Infiniti?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, difficulty passing emissions tests, and sometimes poor engine performance.

4. Can I drive my Infiniti with the P0037 code?

While you can drive with this code, it is not recommended as it may lead to reduced fuel efficiency and potential long-term damage to the catalytic converter.

5. How do I fix the P0037 code on an Infiniti?

Repairs typically involve replacing the downstream oxygen sensor, repairing damaged wiring or connectors, checking fuses, or, in rare cases, replacing the ECM.

6. How do I diagnose the P0037 code on an Infiniti?

Diagnosis involves using a scan tool to confirm the code, visually inspecting the oxygen sensor and its wiring, testing the heater circuit for proper voltage, and checking the fuse for the sensor.

7. How much does it cost to fix the P0037 code on an Infiniti?

Replacing the oxygen sensor typically costs between $150 and $300, including parts and labor. Wiring or ECM repairs may vary depending on the extent of the issue.

8. What is the function of the HO2S12 sensor on an Infiniti?

The HO2S12 sensor monitors the oxygen levels in the exhaust after the catalytic converter and helps the ECM optimize fuel mixture and emissions.

9. Can a bad oxygen sensor cause the P0037 code on an Infiniti?

Yes, a faulty downstream oxygen sensor is one of the most common reasons for this code to appear.

10. Is a special tool needed to fix the P0037 code on an Infiniti?

Yes, you may need an OBDII scan tool for diagnosis and an oxygen sensor socket for sensor removal and replacement.

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