P0061 Code - HO2S Heater Resistance (Bank 2 Sensor 3)

What Does Code P0061 Mean

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.

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Possible symptoms

Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

These could include a lean or rich condition in the engine, decreased fuel efficiency, black smoke from the tailpipe, and an illuminated service engine soon lamp.

• Blown fuse or burnt fusible link
• Defective engine control relay
• Burnt, broken, or disconnected wiring and/or connectors
• A faulty O2 sensor

Common Causes

Possible causes include a faulty oxygen sensor, faulty electrical connector at the oxygen sensor, faulty or shorted wiring in the oxygen sensor circuit, a blown fuse for the oxygen sensor (if applicable), low or excessive fuel pressure, a vacuum leak on the engine, excessive exhaust leaks, or a faulty PCM. PCM failure is rare.

Searches related to P0061

• p0062
• gm dtc 0024
• p0016