Outline Of Diagnosis
WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For the detection standard, refer to DTC P015A. < Refer to
DTC P015A O2 SENSOR DELAYED RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1) , Diagnostic Trouble Code (DTC) Detecting Criteria. >