Home >> Subaru >> 2019 >> Outback 2.5i >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (2.5L) (Diagnostics) (1 Of 4) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0031: A/F/O2 Heater Control Circuit Low Bank 1 Sensor 1 >> Execution Condition