by Manaz » Mon Jun 23, 2014 10:44 pm
It's the post-cat O2 sensor. The pre-cat AFR sensor throws a different code (P0032 (HO2S Heater Control Circuit High, Bank 1 Sensor 1)).
The pre-cat sensor is about $650 from Subaru, the post-cat sensor is much cheaper (somewhere around $200 I believe).