Bank one is on the side of cylinder one. Cylinder one is typically on the driver side. Although, you have to be careful here. Just because the code mentioned the O2 sensor doesn't mean the sensor is bad. For instance, a code of P0171: sensor indicates lean, bank one sensor; one is not a bad sensor. That is a good sensor telling you that the engine is running lean on bank one. If you get a different code, then it could the be the sensor.
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P0031 HO2S Heater Control Circuit Low (Bank 1, Sensor 1)
The O2 sensors are heated by an internal electrical grid. If this grid fails or looses power, the sensor will not function properly when the computer expects to use it. First, check to make sure the sensor plug is connected firmly and that there is no grease or gunk inside the connector. Likely replacing the sensor will solve your problem but just keep in mind the issue can be with the vehicle wiring.
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the code P0031 was detected...heater circuit low. new sensor or something else?
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