P0137 – OBD-II DTC

OBD-II DTC P0137 – O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

DTC P0137 meaning

DTC P0137 refers to a malfunction in the oxygen sensor circuit for Bank 1 Sensor 2. This code indicates that the voltage signal from the oxygen sensor is lower than the expected range, which can affect the engine’s air-fuel mixture and overall performance. Bank 1 refers to the side of the engine that contains cylinder number one, while Sensor 2 is typically located after the catalytic converter.

DTC P0137 symptoms

Common symptoms associated with DTC P0137 may include:

• Check Engine Light illuminated
• Decreased fuel efficiency
• Rough engine idle
• Increased emissions
• Failed emissions test

DTC P0137 causes

Several factors can lead to the triggering of DTC P0137, including:

• Faulty oxygen sensor
• Wiring issues or damaged connectors
• Exhaust leaks before the sensor
• Contaminated or damaged sensor
• Engine performance issues affecting air-fuel mixture

DTC P0137 seriousness

DTC P0137 is considered a moderate to serious issue. While it may not cause immediate engine failure, it can lead to:

• Increased fuel consumption
• Higher emissions, potentially failing emissions tests
• Long-term engine damage if not addressed

How to diagnose DTC P0137

To diagnose DTC P0137, follow these steps:

1. Use an OBD-II scanner to confirm the code and check for any additional codes.
2. Inspect the oxygen sensor wiring and connectors for damage or corrosion.
3. Check for exhaust leaks before the sensor.
4. Test the oxygen sensor’s voltage output using a multimeter.
5. Evaluate the engine’s performance and air-fuel mixture.

How to fix DTC P0137 step-by-step instructions

To fix DTC P0137, follow these steps:

1. Repair or replace any damaged wiring or connectors related to the oxygen sensor.
2. Fix any exhaust leaks found during diagnosis.
3. If the oxygen sensor is faulty, replace it with a new one.
4. Clear the DTC using an OBD-II scanner.
5. Test drive the vehicle to ensure the code does not return.

How to erase DTC P0137

To erase DTC P0137, you can:

• Use an OBD-II scanner to clear the trouble code.
• Disconnect the vehicle’s battery for a few minutes, then reconnect it (note that this may reset other systems).

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.