DTC P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2): DTC Detecting Condition

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Detected when two consecutive driving cycles with fault occur.
GENERAL DESCRIPTION < refer to DTC P0139 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 2) , Diagnostic Trouble Code (DTC) Detecting Criteria. >
CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode < refer to OPERATION , Clear Memory Mode. >, and Inspection Mode < refer to PROCEDURE , Inspection Mode. >.