i recently changed out both the catalytic converter, it was brand new and OEM spec(EPA approved direct bolt on) from a reputable place and the o2 sensor with a brand new OEM one. THE CEL is STILL ON! i think i remember reading a post about the ecu or something had to be changed out for the 6th gen if this happens?

 

Thank you for posting about the ULEV engine ehudson. It finally solved my problem after 3 months of struggling! I did go back to Napa (where I bought the original part) and I got a part that did work a Bosch #13493 (F0260951). I put it in and within the first 5 minutes it was in the light turned off and the codes were clear! Thanks again for your help.