When I got my rx300 it had no gas cap..no lights on dash at all either..I stop n got a gas cap and tightened til it clicked 3 times and then my vsc and check engine light came on..I loosened the cap and reset the codes this morning..gonna see if its just the aftermarket gas caps and throws it again..hopefully it won't as id drove maybe 5miles when it had decided to kick on..gas cap is the only thing I'd messed w so we shall see lol..I know from past experience my Honda engine light wld come on if the cap wasn't clicked 3 times..maybe its a Lexus or aftermarket cap thing...
