DTC P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1): DTC Detecting Condition

WARNING: This page is about a different car, the 2012 Subaru Legacy. 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 P0133 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1) , 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..

Step	Check	Yes	No
1 CHECK EXHAUST SYSTEM. NOTE: Check the following items. Loose installation of front portion of exhaust pipe onto cylinder heads Loose connection between front exhaust pipe and front catalytic converter Damage of exhaust pipe resulting in a hole	Is there any fault in exhaust system?	Repair the exhaust system.	Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR Front Oxygen (A/F) Sensor.