How do you reset the check engine light on a 2000 Toyota Echo?

If your check engine light has come on, that means the cars computer a detected something wrong. If everything seems to be in order, take it to an auto parts store "Auto Zone", and the will hook up an OBDII scanner "On Board Diagnostics system" and that will give them a code and they can look up that code and tell you what has set the check engine light off and then they can clear the code.