Chevy OBD2 Code P0137: Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 2)

The dreaded P0137 code has reared its ugly head. This code, specifically relating to a Chevy, indicates a problem with your oxygen sensor circuit, specifically low voltage detected in Bank 1, Sensor 2. Understanding this code is crucial for maintaining your Chevy’s performance and fuel efficiency. This article provides a comprehensive guide to diagnosing and resolving the P0137 code in your Chevy.

Understanding the P0137 Code

The P0137 code specifically refers to the downstream oxygen sensor (Sensor 2) on Bank 1. Bank 1 is the side of the engine containing cylinder 1. The downstream sensor monitors the catalytic converter’s efficiency. A low voltage reading suggests the sensor isn’t generating the expected voltage signal, potentially indicating a faulty sensor, wiring issue, or exhaust leak.

Chevy OBD2 Code P0137: Downstream Oxygen Sensor Location

Common Causes of P0137 in Chevy Vehicles

Several issues can trigger a P0137 code in your Chevy. These include:

Faulty Oxygen Sensor: A malfunctioning oxygen sensor is the most common culprit. Over time, sensors can degrade, become contaminated, or fail completely.
Wiring Problems: Damaged, corroded, or loose wiring in the sensor circuit can disrupt the voltage signal.
Exhaust Leaks: Leaks before the downstream sensor can introduce outside air, affecting the sensor’s readings and causing low voltage.
Vacuum Leaks: Unmetered air entering the engine can alter the air/fuel mixture and impact the oxygen sensor readings.
Faulty Catalytic Converter: Though less common, a failing catalytic converter can also contribute to a P0137 code.

Diagnosing the P0137 Code

Diagnosing the P0137 code requires a systematic approach:

Verify the Code: Use an OBD2 scanner to confirm the P0137 code and check for other related codes.
Visual Inspection: Carefully examine the wiring and connector for the oxygen sensor. Look for damage, corrosion, or loose connections.
Voltage Test: Use a multimeter to test the sensor’s voltage output. Compare the reading with the manufacturer’s specifications.
Exhaust Leak Check: Inspect the exhaust system for leaks, particularly before the downstream sensor.
Vacuum Leak Check: Inspect vacuum hoses and connections for leaks.

Chevy OBD2 Code P0137: Voltage Test on Oxygen Sensor

How to Fix the P0137 Code

Once you’ve identified the cause, the appropriate fix can be implemented:

Replace the Oxygen Sensor: If the sensor is faulty, replacement is the most common solution.
Repair Wiring: Repair or replace any damaged, corroded, or loose wiring in the sensor circuit.
Repair Exhaust Leaks: Address any exhaust leaks, particularly before the downstream sensor.
Repair Vacuum Leaks: Fix any vacuum leaks to ensure proper air/fuel mixture.
Replace Catalytic Converter: In rare cases, a failing catalytic converter may need replacement.

What Happens If You Ignore the P0137 Code?

Ignoring the P0137 code can lead to:

Reduced Fuel Economy: A malfunctioning oxygen sensor can cause the engine to run rich, wasting fuel.
Increased Emissions: Higher emissions contribute to air pollution.
Damage to the Catalytic Converter: A continuously rich mixture can damage the catalytic converter over time.
Potential Engine Damage: In severe cases, ignoring the code can lead to engine damage.

Expert Insights

John Peterson, a seasoned automotive technician with over 20 years of experience, emphasizes the importance of addressing the P0137 code promptly: “Ignoring this code can lead to more expensive repairs down the road. A simple oxygen sensor replacement can prevent further damage to your catalytic converter or engine.” He also advises using high-quality OEM or equivalent sensors for optimal performance and longevity.

Another expert, Dr. Emily Carter, an automotive engineer specializing in emissions control, adds, “The downstream oxygen sensor plays a crucial role in monitoring the catalytic converter’s effectiveness. A faulty sensor can mask a failing converter, leading to increased emissions and potential legal issues.”

Conclusion

The P0137 code in your Chevy signals a problem with the downstream oxygen sensor circuit. Addressing this issue promptly is crucial to maintain your vehicle’s performance, fuel efficiency, and emissions compliance. By following the diagnostic and repair steps outlined in this article, you can effectively resolve the P0137 code and prevent further complications. Ignoring this code can lead to more costly repairs down the line.

FAQs

Can I drive my Chevy with a P0137 code? While you can technically drive with this code, it’s not recommended. It can lead to reduced fuel economy and potential damage to other components.
How much does it cost to replace an oxygen sensor? The cost varies depending on the make and model of your Chevy, but typically ranges from $100 to $300.
Can I replace the oxygen sensor myself? Replacing an oxygen sensor is a relatively straightforward task for those with basic mechanical skills.
How often should oxygen sensors be replaced? Oxygen sensors typically last between 60,000 and 90,000 miles.
What other codes are related to the P0137 code? Related codes might include P0136, P0138, P0139, and P0140, which also pertain to oxygen sensor issues.
Can a bad fuel pump cause a P0137 code? While less common, a failing fuel pump can indirectly contribute to oxygen sensor issues.
Can a bad MAF sensor cause a P0137 code? A faulty MAF sensor can affect the air/fuel mixture and potentially trigger oxygen sensor codes like P0137.

Do you also experience issues with chevy impala obd2 code p0138?

For further assistance, please contact us via WhatsApp: +1(641)206-8880, Email: [email protected] or visit us at 789 Elm Street, San Francisco, CA 94102, USA. Our customer support team is available 24/7.