Hi all, just reading the comments unders this topic
I'm in the same situation - my check engine light came on on a 1999 RX300 (137k miles), took it to Auto Zone and they came up with a P1130 and P1135. Tracked it down to a Air Fuel Sensor Malfunction (Bank 1, Sensor 1)
I've order the part online, but I;m trying to figure out where it is and how to change it.
Anyone has any pictures to share or a manual on how to find it and change it, would be greatly appreciated