I have a 2003 Subaru Legacy L with the EJ251. I rebuilt the engine because of a thrown rod. There was significant damage to the shortblock, which resulted in a significant amount of oil escaping the tailpipe. I replaced the shortblock and rebuilt the engine. After the first ~1hr of engine time there was no oil visibly escaping the tailpipe. I spent about 500 miles resolving a transmission issue and test driving, and just took the car for the first few highway drive tests. After a recent highway drive I got the following codes:
These both point to problems in the exhaust land, but I am not sure how to interpret these into a fix. I think the oil damaged the sensor(s) and cat. I don't know much about exhaust. What is the best way to address these codes? (I live in a state without emissions inspections.)