Refer to DTC P0031.
Refer to DTC P0031: Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); DTC P0032: Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1); DTC P101D: A/F Sensor Heater Circuit Performance Bank 1 Sensor 1 Stuck ON [08/2014 - ]