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P0144 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The problem codes are a very important indicator of potential problems with the vehicle’s systems, within the technical world of car diagnostics. One such code related to the Oxygen Sensor Circuit High Voltage for Bank 1 Sensor 3 is the P0144 DTC Diagnostic Trouble Code. For the maintenance of your vehicle’s efficiency and to diagnose any underlying problem in an effective manner, it is important to understand what P0144 means and its implications.


The P0144 code is directed specifically at the High Voltage condition in Bank 1 Sensor 3’s circuit of Oxygen Sensor O2. Monitoring the oxygen content in exhaust gases shall be the responsibility of O2 sensors when they have left the engine. In order to adjust the air-fuel mixture and optimize engine performance, this information is essential for the engine control module (ECM).


The P0144 error code may appear for several reasons:

  • Faulty Oxygen Sensor: If the O2 sensor is malfunctioning, the ECM may get inaccurate voltage values.
  • Wire Issues: High voltage signals might be caused by corroded or damaged wire that connects the O2 sensor to the ECM.
  • Connector problems: The transmission between the O2 sensor and the ECM may be hampered by loose or damaged connectors.
  • Leaks in the Exhaust System: Any leaks in the exhaust system before the O2 sensor might have an impact on sensor readings and raise the voltage.
  • ECM Malfunction: The P0144 error code can occasionally be caused by the Engine Control Module itself.


You may notice a number of symptoms when the P0144 code is activated that point to possible problems with your car:

  • Illuminated Check Engine Light: The most apparent sign of a trouble code, the check engine light is activated.
  • Decreased Engine Performance: Due to faulty air-fuel mixture changes, the engine may show lower power, hesitancy, or rough idling.
  • Higher Emissions: Inaccurate O2 sensor readings might result in higher emissions, which could cause the car to fail emission tests.


A methodical strategy is needed to correctly identify the P0144 code’s root cause. The following diagnostic procedures can be carried out by a skilled mechanic or an OBD-II scanner:

  • Checking for Codes: The P0144 code may be read and retrieved from the vehicle’s ECM using an OBD-II scanner.
  • Visual Inspection: To find any obvious problems, the O2 sensor’s wiring and connections must be thoroughly inspected visually.
  • Testing the Oxygen Sensor: The voltage output of the sensor should be measured with a multimeter to determine its performance.
  • Examining the Exhaust System for Leaks: If the exhaust system has leaks, the readings from the O2 sensor may be off.

Common mistakes

Some typical errors can happen during diagnostics and repairs, resulting in inaccurate or inefficient fixes:

  • Ignoring wire and Connectors: A loose connector or broken wire is frequently the cause of problems but is frequently disregarded.
  • Replacing the oxygen sensor without testing: Before contemplating a replacement, the sensor’s functionality must be properly tested.
  • Ignoring Exhaust System Leaks: Since exhaust system leaks might alter O2 sensor readings, they should be fixed.

How serious is this?

The seriousness of the P0144 code varies from one factor to another. While it may be a slight inconvenience, leaving the issue unsolved can have serious implications for engine performance as well as increased emissions. In order not to have additional complications, timely diagnosis and repair should be considered.

What repairs can fix the code?

repair manuals

The following remedies can be made if the P0144 code’s underlying cause has been found:

  • Replacement of the oxygen sensor: If the sensor is broken, a suitable and superior replacement should be used.
  • Fixing wires and connections: If required, damaged wires or connections should be fixed or replaced.
  • Repairing Exhaust Leaks: To stop the entry of outside air, any leaks in the exhaust system before the O2 sensor should be patched.

Related codes

Occasionally, other DTCs might accompany the P0144 code, providing additional insights into related issues. Commonly related codes include P0130 (Oxygen Sensor Circuit, Bank 1 Sensor 1) and P0134 (Oxygen Sensor Circuit, No Activity Detected, Bank 1 Sensor 1).


Finally, the P0144 DTC code tells us that Bank 1 Sensors 3 may have problems with an Oxygen Sensor Circuit at high voltage. You may find it helpful to understand the meaning, causes, symptoms, and correct repairs so that this can be addressed effectively. 

Swift diagnosis and proper fixes will not only clear the code but also ensure your vehicle operates optimally, leading to a smoother and more efficient driving experience. To keep your car in the best possible condition, be sure to ask for a proper diagnosis and safe repair from an expert mechanic.

P0144 Code – What Does It Mean & How To Fix It