P0137 Fault Code

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0137 fault code indicates that there is a low voltage condition in the O2 sensor circuit for Bank 1 Sensor 2. This sensor is crucial for monitoring the oxygen levels in the exhaust gases after they have passed through the catalytic converter. When the voltage output from the sensor drops below a specified threshold, this code is triggered.

This issue can negatively impact the vehicle's fuel efficiency and emissions output, as the engine control unit (ECU) relies on accurate data from the O2 sensors to adjust the air-fuel mixture.

What are the symptoms of the P0137 code?

Common symptoms associated with the P0137 code may include:

• Decreased fuel efficiency due to improper air-fuel mixture
• Increased emissions output, potentially leading to failed emissions tests
• Illuminated check engine light on the dashboard
• Poor engine performance, including rough idling or acceleration issues

What causes the P0137 code?

Several factors can lead to the P0137 fault code, including:

• A faulty O2 sensor
• Damaged or frayed wiring in the O2 sensor circuit
• Corrosion in the sensor connector
• An exhaust leak near the sensor
• Wiring issues, such as shorts to ground or open circuits

How to fix P0137?

To address the P0137 code, you can take the following steps:

• Inspect the O2 sensor and its wiring for any visible damage or corrosion.
• Test the O2 sensor's voltage output using a multimeter, and replace it if it is outside of specifications.
• Check for exhaust leaks near the sensor, as this can affect readings.
• Repair or replace any damaged wiring or connectors in the sensor circuit.
• Clear the fault code using an OBD-II scanner and conduct a road test to ensure the problem is resolved.