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hi i have smal question,how to change thermostat in Toyota echo 2000 thanks
It's electronic.
Should be at the bottom of the radiator, somewhere on the passenger side.
The one closest to the exhaust manifold is the upstream O2 sensor.
Its included in the following instructions for changing out the post cat O2 sensor. http://www.carspace.com/guides/Toyota-Echo-How-to-change-post-catalytic-O2-Sensor
You can get a refurbished one for about $70. See: http://lmgtfy.com/?q=toyota+echo+mass+airflow+sensor
It is inside the Mass Airflow Sensor (MAF sensor), IN OTHERS WORDS IS PART OF THIS.
It is located on the bottom of the radiator
Right next to the air filter.
See related link which includes instructions for testing any O2 sensor.
Probably 1lb. There is a sticker on the radiator crossmember telling you the capacity
It doesn't use a Map sensor , it use a MAF sensor , and it is located right on top of the Air filter box