replace 02 sensors several times. Hasn't done any good.

[Abe Scott]

02 RX 300  replaces o2 sensors vsc on CEl on and transmission will not shift in overdrive while lights are on.  Reset codes lights off trans shifts find. I think I saw an article somewhere that said,  the intake air control valve #2 would cause this. This is not the idle air control valve.  I cannot Find the post or the article, any help would be appreciated thanks.