Yes
jack up front of car remove left front undercar cover sensor found under crank shaft pully remove connector and measure resisitence of sensor aprox 900 to 1800 ohms
Needle nose pliars.
You can replace your 2003 Toyota Echo antenna. Remove the antenna retaining nut. Remove the cable from the bottom of the antenna. Reverse the process to install the new antenna.
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See related link.
How to open hood on Toyota echo
You wait until it falls off on its own.
On top of the engine, but you have to remove the cover to see them.
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
yes
Remove the immobilizer unit?