1999 LEXUS ES300 EXTERIOR COLOR: CASHEMERE TAN INTERIOR COLOR:GRAY SUNROOF LEATHER 6 DISK CD CHANGER PAID:$5800.00 MARCH 17th 2010 MARCH 31st.2010: It runs beautifully, but, on the way home the day we bought it the engine light and trac off light came on. Took it and had the codes ran and it came back P1135 and P1155 which is oxygen sensors,bank 1 sensor 1 & bank 2 sensor 1. Took it to a mechanic and he said the sensors were okay that it was the ECM (electronic control module). So we took it for a second opinion and was told definately not the ECM it was the oxygen sensors.Got them replaced,lights went off. Stopped at the store turned car back on and both lights came on. Took it back to mechanic and he found messed up wire so fixed that and re-replaced O2 sensors. Lights went off. Drove it. Turned it off and back on,lights bcame back on. So we still are trying to find the source of the problem. Any ideas? I could use some advice. Alot of $ going out !!!! APRIL 5th.2010 Update: auto shop says that they need to re-replace the oxygen sensors with Denso brand sensors since thats what was originally on the car and that the lights will go off then. They had to order them from 2 different places . So been waiting for them to come in sinve Thursday April 1st! One came in today April 5th. Hopefully the other comes in 2 morrow and we can get this solved finally. No charge for the new sensors or labor since its their fault they didnt do it in the first place. And the time & $ I lost the past 2 weeks waitimg for them to fix this.I cant have it inspected till the lights are off so this is really getting to the point where i'm going to have a nervous breakdown! I'm sure it will be done soon, i just hate waiting!!!If U have any advise please,please,please post it. I could really use it! I love my car, but I want it fixed ,I need it inspected and i'm just not one of those people that can ignore the engine light being on. Some can, I can't...HELP!!!