The cel flashing means there is a missfire or ramdom misfire that needs to be taken
care of urgently or damage to the catalytic will take place. This does not mean the
computers has to be flashed, if you still wish to flash your ecm it will have to be done
on line, at the toyota website with your maxiflash pro and a laptop with a subscription.

Ok the website for toyota/lexus/scion is https//techinfo.toyota.com. there are 2
different softwares techstream which is used for diagnostic and it has to be
purchased, the other software is used for flashing, it can be downloded after you pay
the 55 dollars subscription. Loging to the site register then read a lot. After you
download and install the j2534 software choose your maxiflash pro as the passthru or
anyother one you may have. Good luck.