AutoCodes – Mercedes-Benz – P0137 Mercedes-Benz

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

Quick Answer

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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: P0137 Mercedes-Benz indicates O2 Sensor Circuit Low Voltage Bank 1 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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 15,878

How popular is this code, among other codes? Low

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0137 Mercedes-Benz Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0137 Mercedes-Benz - O2 Sensor Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0137 Mercedes-Benz Code - O2 Sensor Circuit Low Voltage Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0137 Mercedes-Benz?

Faulty Rear Heated Oxygen Sensor Bank 1
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0137 Mercedes-Benz?

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

Replacing the rear O2 Sensor bank 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0137 Mercedes-Benz 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.

Need more information about the P0137 Mercedes-Benz code?

Need more information on how to fix the P0137 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0137 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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.