Home › Subaru › 2016 › Forester 2.5i, Eng CD FB25BA, Standard Trans › Repair and Diagnosis › Engine Performance › System › Engine Controls (Diagnostics) (H4DO) › Diagnostic Procedure with Diagnostic Trouble Code (DTC) › DTC P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) › Execution Condition