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

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Cost of diagnosing the P0144 code

P0144 is a diagnostic trouble code (DTC) for "O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
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Toyota$70.00$30.00
BMW$70.00$30.00
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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.

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Chris

15 years of experience
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Chris
15 years of experience
Chris was very accommodating to come to my car at 8pm on a Sunday evening. Although the appointment was only for diagnostics of a check engine light on, Chris not only determined the problem but saw there was an easy solution and just fixed it outright. He also noticed some slightly larger issues, unrelated to the check engine light, that I should be aware of and notated those for future attention. Chris explained what he was doing at each step, and used plain English to describe it to me. This was a far more comfortable experience for me (non-mechanical) than going to a shop, and I definitely would call upon Chris again
2005 HYUNDAI SANTA FE - CHECK ENGINE LIGHT IS ON - HOUSTON, TEXAS

Kinder

18 years of experience
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Kinder
18 years of experience
He was great! Showed on time, took his time testing and diagnosing my issue and explained everything he was doing. Very knowledgeable.
2006 DODGE DURANGO - CHECK ENGINE LIGHT IS ON - DOUGLASVILLE, GEORGIA

Chris

13 years of experience
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Chris
13 years of experience
Chris came on time. He was unable to recharge our A/C because he proposed a set of preliminary tests for which he did not have the equipment to perform.
2003 FORD E-350 CLUB WAGON - CHECK ENGINE LIGHT IS ON - SAN DIEGO, CALIFORNIA

Sam

12 years of experience
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Sam
12 years of experience
Great man. He knows what he is doing. Explained everything to me and what needed to be done. Have used Sam before and waiting on a part then I will get all 3 repairs done to get my car running in good condition. Would recommend Sam to everyone.
2007 FORD ESCAPE - CHECK ENGINE LIGHT IS ON - OKLAHOMA CITY, OKLAHOMA

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