I changed 3 O2 Sensors on my 2006 Toyota Avalon bur, the check engine light is still on. Had someone use a OBDII to clear the codes. The light went off for a minute then, back on, what should I do?

First you sould be aware that all the O2 sensors do is make you aware that you have a problem, Changing the O2 sensors does not cure the problem .. in fact ,, it's only confirming that the problem is still there. A Good On Board Diagnostic will tell you the sensor that's triggering the alarm ... by knowing what sensor is sending the alarm ,,you can determine the problem . If it's before the catalytic converter it's an engine issue ,,if it's after then it's a converter issue

The Codes were P2195 and P0031

Toyota Service Bulletin P2195 - Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1) P0031 Oxygen (A/F)Sensor Heater Control Low (Bank 1 Sensor 1) ~~https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CCQQFjABahUKEwjm_rKmkPLIAhXK7yYKHYthCDA&url=http%3A%2F%2Fww2.justanswer.com%2Fuploads%2Fsnd27613%2F2008-10-22_002248_p0171.pdf&usg=AFQjCNGQyylbMcov76ps6XPs8h2g5PmZxQ&sig2=hq4wltUmhiMFT57Yz3yywQ&bvm=bv.106379543,d.eWE&cad=rjt

So, disconnecting the battery will not help? There were some people on here that stated, disconnecting the battery helped clear the codes after changing the O2 sensors and they have been fine sense then.

I sent you a Service Builtin Dude (RECALL) I don't know if you like that answer but that's as good as it gets

I had to drive mine for several miles about 500 and it finally cleared itself out. I have an 05 avalon. What the codes were reading I had fixed and the garage said it would clear after I ran for a while. I was so happy when it really did go off one day when I started it. I'm a female and dont know much but if you replaced what was needed that's probably what you have to do is just wait.