I went to the dealership this weekend because I had a CEL and pulled the code p0420 at auto zone and they told me it was the Catalitic Converter. I have 79,745 mile on the car and the dealeship told me it was just the O2 sensor and replaced it for $514. When I was driving home the CEL came back on. I understand that the emissions warranty is 8 years or 80k miles. Do you guys think the dealeship cleared the code and replaced my O2 sensor hoping it wouldn't come back until I passed 80k miles so they wouldn't have to pay for warranty work? The problem now is I live 250 miles from the colsest Subaru dealer and I still have to get to work this week.