Lexs400

My 92LS had a traction off / check engine light come on last year.
took it to the dealer and they replaced the oxygen sensors. since then everything was fine. Just two weeks ago the same two lights came back. After driving for a while the lights were gone but came back again. So I took it back to the dealer. They said that they were false codes and that they have cleared the memory with the false codes in it. two weeks pass by and the lights are back again...
what's going on ? any ideas ? I could care less about the false codes but when the lights come on , the traction doesnt work and that is a problem...

SharpLS-96

Try disconnecting your positive terminal on your battery for a few minutes and then reconnecting it in order to reset your ECU and see if that helps