P0144 Fault Code

O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)

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

The P0144 fault code signals a problem with the oxygen sensor circuit, specifically indicating a high voltage reading from Bank 2 Sensor 3. This sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases, which helps the engine control module (ECM) adjust the air-fuel mixture for optimal performance.

• Oxygen sensors are essential for emissions control and fuel efficiency.
• Bank 2 refers to the side of the engine opposite to Bank 1.
• Sensor 3 is typically located after the catalytic converter, often referred to as a downstream sensor.

What are the symptoms of the P0144 code?

If your vehicle is displaying the P0144 fault code, you may notice symptoms such as:

• Poor fuel economy due to incorrect air-fuel mixture adjustments.
• Increased emissions, which may lead to failing an emissions test.
• Check Engine Light (CEL) illuminated on the dashboard.
• Rough idling or hesitation during acceleration.
• Unusual exhaust odors or sounds, indicating possible issues in the exhaust system.

What causes the P0144 code?

Several factors can lead to the P0144 fault code:

• Faulty oxygen sensor: The sensor may have failed as a result of age or damage.
• Wiring issues: Damaged or frayed wiring and connectors could lead to erroneous readings.
• Exhaust leaks: Leaks in the exhaust system can introduce extra oxygen, skewing sensor readings.
• Engine performance issues: Problems with engine performance might affect the sensor's ability to function correctly.
• ECM issues: A malfunctioning engine control module can misinterpret sensor data.

How to fix P0144?

To resolve the P0144 fault code, consider the following steps:

• Inspect and replace the oxygen sensor if it is found to be faulty.
• Examine the wiring and connectors associated with Bank 2 Sensor 3 for damage or corrosion and repair as needed.
• Check for exhaust leaks in the system and fix them to ensure accurate sensor readings.
• Test the engine control module and update or reprogram if necessary to restore proper function.
• Clear the fault code and test drive the vehicle to ensure the issue has been resolved.