im having a similar problem..i had sensor1 bank 1 and sensor 2 bank1....had it checked ,changed and within a few weeks it came back on again....same codes.because of parts warranty i had them changed again with fault codes cleared.(all done at a lexus dealership).
once cleared the light stays off for a while and eventually reappears.
everyone i speak to is confused.
im also being told that either the third sensor on the back end is going or my catalytic converters are going??...help me someone please!!!
