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Engine-Codes – Subaru – P0137 Subaru

P0137 Subaru Code - O2 Sensor Circuit Low Voltage

Quick Answer

The P0137 code for Subaru vehicles indicates a problem with the O2 (oxygen) sensor circuit having low voltage. Common causes include Faulty O2 sensor, Wiring or connector issues in the O2 sensor circuit, Exhaust leaks near the O2 sensor. 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
P0137 Subaru indicates O2 Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty O2 sensor, Wiring or connector issues in the O2 sensor circuit, Exhaust leaks near the O2 sensor.
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 Aug 30, 2024
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Code P0137 Subaru Description

The P0137 code for Subaru vehicles indicates a problem with the O2 (oxygen) sensor circuit having low voltage. The O2 sensor is responsible for measuring the amount of oxygen in the exhaust gases and sending this information to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. A low voltage reading from the O2 sensor can lead to incorrect fuel mixture adjustments, affecting the engine's performance and emissions.

OBDII Code P0137 Subaru - O2 Sensor Circuit Low Voltage
P0137 Subaru Code - O2 Sensor Circuit Low Voltage

Common Causes of P0137 Subaru

  1. Faulty O2 sensor
  2. Wiring or connector issues in the O2 sensor circuit
  3. Exhaust leaks near the O2 sensor
  4. Engine vacuum leaks
  5. Issues with the ECM

Symptoms of P0137 Subaru

  1. Decreased fuel efficiency
  2. Engine misfires or hesitation
  3. Rough idling or stalling
  4. Increased emissions
  5. Check Engine Light illuminated

How to Fix P0137 Subaru

  1. Perform a visual inspection of the O2 sensor and its wiring for any signs of damage or corrosion.
  2. Test the O2 sensor using a multimeter to check for proper voltage readings.
  3. Replace the O2 sensor if it is found to be faulty.
  4. Repair or replace any damaged wiring or connectors in the O2 sensor circuit.
  5. Clear the diagnostic trouble codes and reset the ECM to see if the issue is resolved.

Cost to Fix P0137 Subaru

The cost of repairing a P0137 code on a Subaru vehicle can vary depending on the specific cause of the issue. Generally, the cost of replacing an O2 sensor ranges from $150 to $300, including parts and labor. Additional costs may apply if there are wiring or connector issues that need to be addressed. It's recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's specific needs and location.

What does this mean?

Tech Notes for P0137 Subaru

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

When is the Code Detected?

The P0137 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor signal voltage remains excessively low for an extended period of time.

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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 P0137 Subaru Code

1. What are the common symptoms of OBDII code P0137 in a Subaru related to the O2 Sensor Circuit Low Voltage?

- Common symptoms include poor fuel efficiency, rough idling, engine hesitation, and potentially a noticeable decrease in overall engine performance.

2. What are the typical causes of the OBDII code P0137 in a Subaru indicating O2 Sensor Circuit Low Voltage?

- The code is commonly triggered by a faulty oxygen (O2) sensor, damaged wiring in the O2 sensor circuit, or a problem with the vehicle's engine control module (ECM).

3. How can I diagnose the O2 Sensor Circuit Low Voltage issue in my Subaru triggering the P0137 code?

- You can diagnose the problem by conducting a visual inspection of the O2 sensor and its wiring, performing an O2 sensor test using a multimeter, or using a scan tool to monitor sensor data.

4. What are some repair tips for addressing the O2 Sensor Circuit Low Voltage problem causing the P0137 code in a Subaru?

- Repair options may include replacing the faulty O2 sensor, repairing damaged wiring in the sensor circuit, or reprogramming/resetting the ECM to address any software-related issues.

5. Can driving with the OBDII code P0137 related to O2 Sensor Circuit Low Voltage harm my Subaru's engine?

- While driving with the issue may not cause immediate harm, it can lead to decreased fuel efficiency and potentially cause long-term damage to the engine if left unresolved.

6. How much does it typically cost to repair the O2 Sensor Circuit Low Voltage problem triggering the P0137 code in a Subaru?

- The cost of repairs can vary depending on the specific issue, but replacing a faulty O2 sensor or repairing wiring may range from $100 to $300, while addressing ECM issues could be more expensive.

7. Can I reset the OBDII code P0137 related to O2 Sensor Circuit Low Voltage in my Subaru without fixing the underlying problem?

- While you can clear the code using a scan tool, the issue will likely reappear if the root cause, such as a faulty O2 sensor or wiring problem, is not addressed.

8. Is it safe to continue driving my Subaru with the O2 Sensor Circuit Low Voltage problem causing the P0137 code?

- It is generally not recommended to drive with this issue for an extended period, as it can impact engine performance and fuel efficiency, potentially leading to more severe problems over time.

9. How often should I replace the O2 sensor in my Subaru to prevent the recurrence of the P0137 code?

- O2 sensors typically have a lifespan of around 50,000 to 100,000 miles, so it is advisable to replace them as part of regular maintenance to avoid triggering codes like P0137.

10. Can a DIY enthusiast with basic mechanical skills fix the O2 Sensor Circuit Low Voltage issue causing the P0137 code in a Subaru?

- Depending on the specific problem, DIY enthusiasts may be able to address issues like replacing the O2 sensor or repairing wiring, but more complex ECM-related fixes may require professional assistance.

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