abakja1 Posted November 18, 2019 Share Posted November 18, 2019 I installed an invidia Catted Jpipe and had a PDX Protune done about 2 months ago. I ran into a code that occurred 3 times now when driving on the freeway only at around 60-70 mph which was a P0420 code. I have been told by fellow Subaru enthusiasts in my area to replace the front O2 sensor, but read on this forum that it should be the rear sensor. On the 2011 LGT, the O2 sensors are close to each other so I really dont know which should be the one to replace now due to different opinions. Any help appreciated. Kevin Link to comment Share on other sites More sharing options...
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