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P0137 Mercedes-Benz Code - O2 Sensor Circuit Low Voltage Bank 1 Sensor 2

Quick Answer

The P0137 code for Mercedes-Benz indicates an issue with the O2 (oxygen) sensor circuit having low voltage for Bank 1 Sensor 2. Common causes include Faulty O2 sensor, Wiring or connector issues in the O2 sensor circuit, Exhaust leaks near the 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 Mercedes-Benz indicates O2 Sensor Circuit Low Voltage Bank 1 Sensor 2.
Common causes
Common causes include Faulty O2 sensor, Wiring or connector issues in the O2 sensor circuit, Exhaust leaks near the 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 Sep 12, 2024
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Code P0137 Mercedes-Benz Description

The P0137 code for Mercedes-Benz indicates an issue with the O2 (oxygen) sensor circuit having low voltage for Bank 1 Sensor 2. The oxygen sensor plays a crucial role in monitoring the amount of oxygen in the exhaust gases to ensure the proper air-fuel ratio for efficient combustion. Bank 1 refers to the side of the engine that contains cylinder 1, while Sensor 2 indicates the downstream sensor located after the catalytic converter.

OBDII Code P0137 Mercedes-Benz - O2 Sensor Circuit Low Voltage Bank 1 Sensor 2
P0137 Mercedes-Benz Code - O2 Sensor Circuit Low Voltage Bank 1 Sensor 2

Common Causes of P0137 Mercedes-Benz

  1. Faulty O2 sensor
  2. Wiring or connector issues in the O2 sensor circuit
  3. Exhaust leaks near the sensor
  4. Engine misfire or other internal engine issues
  5. Faulty ECM

Symptoms of P0137 Mercedes-Benz

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

How to Fix P0137 Mercedes-Benz

  1. Diagnose the issue with a scan tool to confirm the P0137 code and pinpoint the exact cause.
  2. Inspect the wiring and connectors related to the O2 sensor for any damage or corrosion. Repair or replace as necessary.
  3. Test the O2 sensor itself to ensure it is functioning properly. Replace the sensor if it is faulty.
  4. Check for exhaust leaks near the sensor and repair them if found.
  5. Clear the code and perform a test drive to ensure the issue is resolved.

Cost to Fix P0137 Mercedes-Benz

The cost of repairing a P0137 code for a Mercedes-Benz can vary depending on the specific cause of the issue and the labor rates in your area. Typically, replacing an O2 sensor can cost between $150 and $300, including parts and labor. However, if additional repairs are needed, such as fixing wiring or addressing engine issues, the cost can increase significantly. It is recommended to consult with a qualified mechanic or dealership to get an accurate estimate for your particular vehicle. Labor rates can range from $80 to $150 per hour, and additional diagnostic time may be required.

What does this mean?

Tech Notes for P0137 Mercedes-Benz

Replacing the rear O2 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 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0137 in a Mercedes-Benz related to the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine light.

2. What are the possible causes of the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 fault code P0137 in a Mercedes-Benz?

- Causes can include a faulty oxygen sensor, wiring issues, a vacuum leak, exhaust system problems, or a malfunctioning engine control module (ECM).

3. How can I diagnose the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 issue in my Mercedes-Benz if I suspect code P0137?

- Use an OBDII scanner to check for the specific code P0137, inspect the wiring and connections to the sensor, and perform tests to determine if the oxygen sensor is functioning correctly.

4. What are some DIY repair tips for fixing the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 error code P0137 in a Mercedes-Benz?

- Check and replace the oxygen sensor if necessary, inspect and repair any damaged wiring, ensure proper installation and secure connections, and clear the code with an OBDII scanner after completing repairs.

5. Can driving with the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 code P0137 in a Mercedes-Benz cause further damage?

- Continuing to drive with this issue can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

6. How much does it typically cost to repair the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 fault code P0137 in a Mercedes-Benz?

- The cost can vary depending on the root cause, but it may range from $100 to $300 for parts and labor if the oxygen sensor or wiring needs replacement.

7. Is it safe to ignore the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 error code P0137 in my Mercedes-Benz?

- Ignoring this code can lead to poor engine performance, reduced fuel efficiency, and potential long-term damage to other components, so it is not recommended to ignore it.

8. How long does it typically take to repair the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 fault code P0137 in a Mercedes-Benz?

- The repair time can vary based on the specific issue, but it may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.

9. Can a faulty oxygen sensor trigger other error codes in addition to P0137 in a Mercedes-Benz?

- Yes, a malfunctioning oxygen sensor can sometimes trigger related error codes such as P0138 (O2 Sensor Circuit High Voltage Bank 1 Sensor 2) or P0141 (O2 Sensor Heater Circuit Bank 1 Sensor 2).

10. Should I attempt to reset the OBDII code P0137 related to the O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 in my Mercedes-Benz on my own?

- It is recommended to diagnose and repair the underlying issue causing the code before attempting to reset it, as simply clearing the code without fixing the problem may lead to it reoccurring.

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