Skip the auto shop - Our mechanics make house calls

P0144 OBD-II Trouble Code: O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)

Check Engine Light

P0144 code definition

O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)

What the P0144 code means

P0144 is the OBD-II generic code which indicates that the Engine Control Module (ECM) has detected excessively high voltage from the bank 1 sensor 3 O2 sensor circuit, indicating a rich condition.

What causes the P0144 code?

  • The O2 sensor bank 1 sensor 3 is the sensor after the last catalyst. A rich condition may be a problem with the catalyst not cleaning the exhaust. This can be caused by a broken up catalyst.

  • The ECM detects a short to power in the circuit for the O2 from a wiring or sensor problem.

What are the symptoms of the P0144 code?

  • The code will cause the ECM to turn on the check engine light.

  • The ECM does not use this sensor for fuel control but for a catalyst monitor only and should not cause a direct impact on the engine performance.

How does a mechanic diagnose the P0144 code?

  • Checks the electrical connections or wire harness cover to the O2 bank 1 sensor 3 for shorts or sensor damage

  • Scans codes and documents freeze frame data, then clears codes to verify the sensor failure

  • Monitors O2 sensor data to see if the voltage is stuck above 500 mV

  • Checks the exhaust catalyst for damage or if it broke apart in the housing

  • Follows the manufacturer's specific pinpoint tests for further diagnosis

Common mistakes when diagnosing the P0144 code

Follow these simple guidelines to prevent mistakes:

  • Check the catalyst integrity for any damage before replacing the O2 sensor

  • Check the O2 sensor for oil or coolant contaminants that may short the sensor from engine leaks

  • Scan the replacement O2 sensor to make sure the heater circuit works properly

  • Check the removed O2 sensor for damage from a defective catalyst that will cause sensor failure

How serious is the P0144 code?

  • The code may cause the engine to fail emission testing.
  • The code may indicate a problem with the catalyst and it may block the exhaust.

What repairs can fix the P0144 code?

Additional comments for consideration regarding the P0144 code

The O2 sensor signal circuit for bank 1 sensor 3 is used to monitor the catalyst efficiency and does not affect the fuel control of the engine.

Need help with a P0144 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...


Related questions

Q: The check engine light on for my 2005 Chevrolet Avalanche

Hey there, thanks for writing in about your 2005 Chevrolet Avalanche. If the gas cap was loose but then later taken care of, then the light may be due to another issue. You will need to have the Check Engine...

Q: my check engine light came on. Took to Auto Zone they gave me these codes P0700 & P1776

According to the diagnostic trouble code listing on AllData, it looks like both of the trouble codes are associated with the transmission. The P0700 code appears to be more of a general information code to let you know other codes...

Q: Check engine light on

Hello. When the Check Engine Light is on in the dashboard, this is an indication that there is a problem that needs to be addressed. The only way to make the engine light go out permanently is to fix the...