THE_PURSUIT

Hi all, I'm in Canada. I took my car (2002 ES300) to Lexus dealer due to check engine light is on. They did some test, got the code P1135 and need front A/F sensor. They gave me the part number 89467-06020. I checked the part on line and this one doesn't exist. The part number that I found is 89467-33050. Does anyone know if they have the differece part no. for U.S. and Canada? And does this A/F sensor have anything to do with Emission test fail? I appreciate all comments/helps. Thanks a lot!!