P0037 Subaru Code - HO2S12 Heater Control Circuit Low
Quick Answer
Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 fuse, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted. 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 Subaru indicates HO2S12 Heater Control Circuit Low.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 fuse, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted.
- 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.
Code P0037 Subaru Description
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
What are the Possible Causes of the DTC P0037 Subaru?
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0037 Subaru?
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.
Code Tech Notes
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0037 Subaru 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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Frequently Asked Questions about P0037 Subaru Code
1. What are the common symptoms of OBDII code P0037 on a Subaru related to the HO2S12 heater control circuit low?
The common symptoms include poor fuel economy, rough idling, stalling, and the illumination of the check engine light.
2. What are the potential causes of OBDII code P0037 on a Subaru indicating a HO2S12 heater control circuit low?
Possible causes include a faulty oxygen sensor, damaged wiring, a blown fuse, or a problem with the ECM (engine control module).
3. How can I diagnose the OBDII code P0037 on my Subaru for the HO2S12 heater control circuit low?
To diagnose this code, you can start by checking the oxygen sensor's wiring and connections, testing the sensor's resistance, inspecting the fuse, and scanning the ECM for any related trouble codes.
4. What are the recommended repair tips for resolving OBDII code P0037 on a Subaru due to a HO2S12 heater control circuit low?
Repair tips may include replacing the faulty oxygen sensor, repairing damaged wiring, checking and replacing the fuse if necessary, and clearing the trouble codes with a scan tool.
5. Can driving with OBDII code P0037 related to the HO2S12 heater control circuit low on a Subaru cause any further damage?
Continuing to drive with this code may lead to decreased fuel efficiency and potential damage to the catalytic converter over time, so it is recommended to address the issue promptly.
6. How much does it typically cost to repair OBDII code P0037 on a Subaru caused by a HO2S12 heater control circuit low?
The cost of repair can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.
7. Is it safe to drive my Subaru with the check engine light on due to OBDII code P0037 indicating a HO2S12 heater control circuit low?
While it may be safe to drive in the short term, it is advisable to address the issue promptly to prevent potential long-term damage and ensure optimal vehicle performance.
8. How long does it usually take to repair OBDII code P0037 on a Subaru related to the HO2S12 heater control circuit low?
The repair time can vary depending on the exact cause of the code and the availability of parts, but it typically takes around 1-2 hours for a professional technician to diagnose and fix the issue.
9. Can I reset the check engine light myself after resolving OBDII code P0037 on my Subaru caused by a HO2S12 heater control circuit low?
Yes, you can typically reset the check engine light by using an OBDII scanner or disconnecting the car's battery for a few minutes. If the issue is resolved, the light should reset.
10. Will OBDII code P0037 on a Subaru for the HO2S12 heater control circuit low pass during an emissions test once repaired?
After resolving the issue and resetting the check engine light, the code should not reappear during an emissions test, assuming the repair was successful and the vehicle's emissions system is functioning properly.
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