Aaron, I don't get notifications from the forum, so this is the first I've seen your message. If you can post up on the thread, it will also help others in understanding the vast array of circumstances that cause this code to pop up. Also, if you have the ability to utilize Rom Raider software to log data that would be a big plus.
I followed your great series of posts on diagnosing a P0420 code almost 2 years ago to successfully correct a problem with my Outback. Now its back, and I think it might be an "edge" case. Are you accepting P0420 questions? Would it be better to post question in a forum? I'd be happy to pay for your consulting time too.
For the best viewing experience please update your browser to Google Chrome