P0144 – OBD-II DTC

OBD-II DTC P0144 – O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)

DTC P0144 meaning

DTC P0144 refers to a diagnostic trouble code indicating a low voltage condition in the oxygen sensor circuit for Bank 1 Sensor 3. This sensor is typically located after the catalytic converter and is responsible for monitoring the efficiency of the catalytic converter and the overall air-fuel mixture. A low voltage reading suggests that the sensor is not functioning correctly or that there is an issue in the circuit.

DTC P0144 symptoms

Common symptoms associated with DTC P0144 may include:

• Check Engine Light illuminated
• Decreased fuel efficiency
• Rough engine idle
• Increased emissions
• Potential failure in emissions testing

DTC P0144 causes

Several factors can lead to the occurrence of DTC P0144, including:

• Faulty oxygen sensor
• Wiring issues, such as shorts or open circuits
• Corroded or damaged connectors
• Exhaust leaks near the sensor
• ECU (Engine Control Unit) malfunction

DTC P0144 seriousness

DTC P0144 is considered a moderate issue. While it may not cause immediate engine failure, it can lead to:

• Increased emissions, which can harm the environment
• Reduced fuel efficiency, leading to higher operating costs
• Potential damage to the catalytic converter if not addressed

How to diagnose DTC P0144

To diagnose DTC P0144, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P0144 code.
2. Inspect the oxygen sensor and its wiring for visible damage or corrosion.
3. Check the voltage and ground signals at the sensor connector.
4. Test the oxygen sensor using a multimeter to ensure it operates within specifications.
5. Examine the exhaust system for leaks that could affect sensor readings.
6. Clear the code and perform a test drive to see if the code reappears.

How to fix DTC P0144 step-by-step instructions

To fix DTC P0144, follow these steps:

1. Identify and repair any wiring issues or damaged connectors.
2. If the oxygen sensor is faulty, replace it with a new one.
3. Ensure all connections are secure and free from corrosion.
4. Fix any exhaust leaks that may be present.
5. Clear the DTC using an OBD-II scanner.
6. Test drive the vehicle to confirm that the issue is resolved and the code does not return.

How to erase DTC P0144

To erase DTC P0144, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear Codes” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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.