P0144 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)

When you see the check engine light illuminated on your dashboard, it is always a cause for concern.

P0144 is a generic diagnostic trouble code (DTC) that indicates there is a problem with the O2 sensor circuit in your vehicle.

Specifically, P0144 refers to the O2 sensor circuit low voltage in bank 1 sensor 3. This may seem like a mouthful, but don’t worry, we will break it down for you in this article.

What is Bank 1 Sensor 3?

Before we dive into the specifics of P0144, it is important to understand what is meant by bank 1 sensor 3. In a V6 or V8 engine, there are typically two banks of cylinders, with each bank containing its own set of sensors.

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Bank 1 refers to the bank of cylinders that contains cylinder number 1.

Sensor 3 refers to the third O2 sensor in that bank.

What is the Role of the O2 Sensor?

The O2 sensor, also known as the oxygen sensor, measures the amount of oxygen in a vehicle’s exhaust system.

This information is used by the engine control module (ECM) to adjust the air-fuel ratio for optimal combustion.

A properly functioning O2 sensor is essential to maintaining fuel efficiency and reducing harmful emissions.

What Causes P0144?

P0144 is triggered when the ECM detects a voltage reading from the O2 sensor that is lower than expected.

This can be caused by a variety of issues, including a faulty O2 sensor, damaged wiring, or a problem with the ECM itself.

Symptoms of P0144

One of the most common symptoms of P0144 is a decrease in fuel efficiency.

You may also notice a decrease in engine performance, particularly during acceleration.

In some cases, you may also experience rough idling or stalling.

Diagnosing P0144

Diagnosing P0144 can be tricky, as there are a number of potential causes.

The first step is to use a diagnostic scanner to read the DTC and any accompanying freeze frame data.

From there, a mechanic will likely perform a visual inspection of the O2 sensor and wiring, as well as check for any other related DTCs.

Repairing P0144

Once the root cause of P0144 has been identified, repairs can begin. In most cases, this will involve replacing the faulty O2 sensor or repairing any damaged wiring. In some cases, the ECM itself may need to be replaced.

Preventing P0144

While there is no guaranteed way to prevent P0144 from occurring, there are a few steps you can take to reduce your risk. Regular maintenance, such as oil changes and tune-ups, can help keep your vehicle in good working order.

Additionally, avoiding harsh driving conditions, such as extreme temperatures or heavy traffic, can help reduce wear and tear on your vehicle’s components.


P0144 may be a complex-sounding code, but it is a relatively common issue that can be diagnosed and repaired by a qualified mechanic. By understanding the role of the O2 sensor and the potential causes of P0144, you can help keep your vehicle running smoothly and efficiently.


  1. Can I still drive my car with P0144?

It is generally safe to drive your car with P0144, but you may experience a decrease in fuel efficiency and engine performance.

  1. How much does it cost to repair P0144?

The cost of repairing P0144 will vary depending on the root cause of the issue and the make and model of your vehicle. In general, you can expect to pay anywhere from $100 to $500 for repairs.

  1. What happens if I ignore P0144?

Ignoring P0144 can lead to decreased fuel efficiency and engine performance, as well as increased emissions. In some cases, ignoring P0144 can also cause damage to other components in your vehicle.

  1. How can I tell if my O2 sensor is bad?

Common signs of a bad O2 sensor include decreased fuel efficiency, rough idling, and a check engine light illuminated on the dashboard.

  1. Is P0144 covered by my car’s warranty?

Whether or not P0144 is covered by your car’s warranty will depend on the specific terms of your warranty. It is best to consult your warranty documentation or speak with your dealership for more information.