Home >> Subaru >> 2015 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) (STI) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0037 Ho2S Heater Control Circuit Low (Bank 1 Sensor 2) >> Component Description