OBD code

[mchowdhu]

Hi, I purchased a 97 ES300 about two months ago. In my past two months of ownership I have experienced the joy of "engine check" light for at least 5 times. It has given the OBD code P133 and P130 for most of the time. The dealer changed the sensor 1 on bank 1 and the one at the rear of the catalyst. It still giving the OBD code P130. I am not sure what to do. Dealer does not have any clue either. The funny thing is the "engine check" light goes away when come to the dealer for the checkup. It happened twice so far. Do you know what causing it to reset the light automatically? I don't believe in ghost. But, I believe there is something wrong internally that my Lexus techs keep overlooking.

Does anybody had this same problem that I have now. If we have a factory tech in this forum, could you put your kind thoughts in this issue?

Your response is greatly appreciated.

Mo