AutoCodes – Buick – P0137 Buick

P0137 Buick Code - HO2S Circuit Low Voltage Bank 1 Sensor 2

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. 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 Buick indicates HO2S 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 18,227

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 May 26, 2022

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

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Engine Control Module (ECM) operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0 - 1, 000 mV. Once sufficient HO2S voltage fluctuation is observed by the ECM, Closed Loop is entered. The ECM uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the heated oxygen sensor is shorted to ground if the HO2S voltage is less than 50 mV.

OBDII Code P0137 Buick - HO2S Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0137 Buick Code - HO2S Circuit Low Voltage Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0137 Buick?

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
Low or high fuel system pressure
Fuel contamination
Faulty fuel injectors
Exhaust gas leaks
Engine vacuum leaks

How to Fix the DTC P0137 Buick?

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 Heated Oxygen Sensor (HO2S) Bank 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0137 Buick 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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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 Buick Code

1. What does the OBDII code P0137 Buick mean?

The code P0137 in a Buick indicates that the HO2S (Heated Oxygen Sensor) circuit for Bank 1 Sensor 2 is registering low voltage.

2. What are the common symptoms of a P0137 Buick code?

Common symptoms include poor fuel economy, rough idling, engine hesitation, and possible stalling.

3. What are the possible causes of a P0137 Buick code?

Potential causes include a faulty oxygen sensor, wiring issues, exhaust leaks, vacuum leaks, or a problem with the engine's air-fuel mixture.

4. How can I diagnose a P0137 Buick code?

Diagnosing this code typically involves checking the oxygen sensor's voltage output, inspecting the sensor's wiring, and looking for any exhaust or vacuum leaks.

5. Can a P0137 Buick code be fixed at home?

Depending on your skill level, you may be able to fix this issue at home by replacing the oxygen sensor, checking and repairing any damaged wiring, or addressing any leaks in the exhaust system.

6. Is it safe to continue driving with a P0137 Buick code?

It is not recommended to drive for an extended period with this code, as it can lead to poor engine performance and potentially cause further damage over time.

7. What is the typical repair cost for a P0137 Buick code?

The repair cost for a P0137 code can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

8. How long does it take to repair a P0137 Buick code?

Repair times can vary based on the specific cause of the code and the extent of the repairs needed, but it typically takes between 1 to 3 hours to address this issue.

9. Can a P0137 Buick code cause other problems if left untreated?

Ignoring a P0137 code can lead to reduced fuel efficiency, increased emissions, and potential damage to other engine components over time.

10. How can I prevent the recurrence of a P0137 Buick code in the future?

To prevent the return of this code, it's essential to perform regular maintenance on your vehicle, including checking and replacing oxygen sensors as recommended by the manufacturer.