AutoCodes – Generic – P0037

P0037 Code - HO2S Heater Control Circuit Low Bank 1 Sensor 2

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open shorted to ground, Heated Oxygen Sensor Bank 1 Sensor 2 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: P0037 indicates HO2S Heater Control Circuit Low Bank 1 Sensor 2.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open shorted to ground, Heated Oxygen Sensor Bank 1 Sensor 2 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 160,173

How popular is this code, among other codes? High

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 Mar 23, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0037 Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to ground in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded OFF for greater than 5 s.

OBDII Code P0037 - HO2S Heater Control Circuit Low Bank 1 Sensor 2 - AutoCodes.com — P0037 Code - HO2S Heater Control Circuit Low Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0037?

Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
Heated Oxygen Sensor Bank 1 Sensor 2 harness is open shorted to ground
Heated Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection
Heated Oxygen Sensor Bank 1 Sensor 2 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0037?

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

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0037 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.

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Information for Specific Makes

P0037 Audi — HO2S Heater Control Circuit Low Bank 1 Sensor 2
P0037 BMW — HO2S 12 Heater Control Circuit Low
P0037 Buick — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 Cadillac — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 Chevrolet — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 Chrysler — O2 Sensor 1/2 Heater Circuit Low
P0037 Dodge — O2 Sensor 1/2 Heater Circuit Low
P0037 Ford — HO2S Heater Control Circuit Low Bank 1 Sensor 2
P0037 GMC — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 Hyundai — HO2S 12 Heater Circuit Low
P0037 Infiniti — HO2S12 Heater Control Circuit Low
P0037 Jeep — O2 Sensor 1/2 Heater Circuit Low
P0037 KIA — HO2S 12 Hater Circuit Low Input
P0037 Lexus — Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
P0037 Lincoln — HO2S Heater Control Circuit Low Bank 1 Sensor 2
P0037 Mazda — HO2S Heater Control Circuit Low 12
P0037 Mercedes-Benz — HO2S Heater Control Circuit Low Bank 1 Sensor 2
P0037 MINI — HO2S 12 Heater Control Circuit Low
P0037 Mitsubishi — Cylinder 1-4 Heated Oxygen Sensor Rear Heater Control Circuit Low
P0037 Nissan — HO2S12 Heater Control Circuit Low
P0037 Pontiac — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 Saturn — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 Scion — Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
P0037 Subaru — HO2S12 Heater Control Circuit Low
P0037 Suzuki — HO2S12 Heater Control Circuit Low
P0037 Toyota — Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 2
P0037 Volkswagen — HO2S Heater Control Circuit Low Bank 1 Sensor 2

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 Code

1. What are the common symptoms of OBDII code P0037 (HO2S Heater Control Circuit Low Bank 1 Sensor 2)?

- Common symptoms include decreased fuel efficiency, rough idling, stalling, and the illumination of the check engine light.

2. What does the OBDII code P0037 indicate in terms of the HO2S Heater Control Circuit Low Bank 1 Sensor 2?

- This code suggests that there is an issue with the heating element circuit of the oxygen sensor located downstream on bank 1 of the engine.

3. What are the possible causes of OBDII code P0037?

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

4. How can I diagnose the cause of OBDII code P0037?

- You can diagnose this code by checking the sensor's wiring and connectors for damage, testing the sensor's heater element resistance, inspecting the fuse related to the sensor circuit, and scanning the ECM for any related faults.

5. Can I continue driving with OBDII code P0037 present?

- It is not recommended to continue driving with this code as it can lead to decreased fuel efficiency and potential engine performance issues.

6. How can I repair OBDII code P0037?

- Repair options include replacing the oxygen sensor, repairing or replacing damaged wiring or connectors, checking and replacing the fuse if necessary, and resetting the ECM after completing repairs.

7. Are there any tips to prevent OBDII code P0037 from recurring?

- To prevent this code from coming back, ensure proper installation of components, maintain the oxygen sensor and its connections, and address any underlying issues promptly.

8. What is the significance of Bank 1 Sensor 2 in the context of OBDII code P0037?

- Bank 1 Sensor 2 refers to the downstream oxygen sensor located after the catalytic converter on bank 1 of the engine, which helps monitor and adjust the air-fuel mixture.

9. Can a DIY enthusiast address OBDII code P0037 at home?

- Depending on your mechanical skills and access to tools, you may be able to address this code at home by following diagnostic procedures and replacing components as needed.

10. How long does it typically take to repair OBDII code P0037?

- The repair time for this code can vary based on the diagnosis findings and the extent of the issue, but it typically ranges from 1 to 3 hours at a professional automotive repair shop.