P0061 OBD-II Trouble Code: HO2S Heater Resistance (Bank 2 Sensor 3)

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Cost of diagnosing the P0061 code

P0061 is a diagnostic trouble code (DTC) for "HO2S Heater Resistance (Bank 2 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 is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

P0061 code definition

P0061 announces that the vehicle’s computer detects an unusual resistance level with oxygen sensor bank 2 sensor 3. An oxygen sensor is used to monitor the the amount of oxygen and harmful exhaust elements exiting the engine. The computer of the vehicle will use the readings of the oxygen sensor to adjust the performance of the engine by changing the air, fuel ratio, and ignition timing.

What the P0061 code means

This trouble code indicates that there is an abnormal resistance detected with the bank 2 sensor 3 oxygen sensor. The oxygen sensors are located on the exhaust pipes and are used by the vehicle’s computer to monitor the amount of fuel being consumed by the engine, as well as the levels of pollutants being created by the engine.

The sensors however are only accurate when they reach a hot temperature of about 600 degrees Fahrenheit. The exhaust pipes themselves would take about 15 minutes of operation to reach such temperatures, but an accurate reading of the oxygen sensor is needed long before that time period. This is why internal heaters were added to the oxygen sensors. The computer will interpret the temperature of the oxygen sensor by reading the resistance of the sensor. If the resistance of the oxygen sensor is out of range, that indicates to the computer that the temperature of the sensor is out of operating range as well.

What causes the P0061 code?

  • A short in the wiring, wiring harness, or connectors of bank 2 sensor 3

  • An open in the wiring, wiring harness, or connectors of bank 2 sensor 3

  • Worn internal heater element

  • Faulty power control module

What are the symptoms of the P0061 code?

  • Idle stumbles up and down
  • Check Engine Light or service engine light will soon illuminate
  • Loss of power or acceleration
  • Engine stall

How does a mechanic diagnose the P0061 code?

  • Back probes the wiring of the oxygen sensor to measure the resistance and voltage levels

  • Separates the oxygen sensor from the exhaust to verify that the sensor itself heats on its own

  • Inspects the wiring and electrical connections related to the oxygen sensor for an open, short, or loose connection

Common mistakes when diagnosing the P0061 code

  • Replacement of the wrong sensor by the misidentification of sensor 1, sensor 2, or sensor 3

  • Not cleaning the oxygens sensors connector(s)

How serious is the P0061 code?

It may be very harmful to the atmosphere because the computer of the vehicle will not be able to track the the amounts of pollutants. The computer relies on the readings of the oxygen sensor to determine if any adjustments need to be made.

These adjustments decrease harmful pollutants, but will also increase the performance, lifespan, and reliability of the vehicle.

What repairs can fix the P0061 code?

  • A replacement of the oxygen sensor (bank 2 sensor 3) will usually repair the issue.

  • At times there can be a dirty, open, or shorted connection causing the trouble code.

Additional comments for consideration regarding the P0061 code

Check that all of the related connectors and wiring are free from dirt, oil, corrosion, and fray.

Need help with a P0100 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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Nazareth

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Nazareth
26 years of experience
Mercedes-Benz CLA250 - Check Engine Light is on - Los Angeles, California
Polite and very professional! Nazareth quickly identified my car was suffering from low voltage issues and the battery was the problem. The reader was showing 8 volts hence why my car didn’t receive enough power to start, it needed 12v. My battery was 4 years old and never been changed. Thank you Nazareth!

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He was very helpful with explaining what could lead to my check engine light being on. And helping clear my engine light.

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Nissan Maxima - Check Engine Light is on - Highland, California
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