See related answers, its already been answered
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
In the red cover on the positive terminal of the battery.
see link
See related link
http://wwww.gordosoft.com:443/echo/Toyota%20Echo%20radio%20replacement%20guide.pdf
yes
In the gas tank. I have 2001 Echo.
2001 Toyota Echo doesn't have a timing belt.
http://groups.msn.com/Sorensonbrian/fuelfilter.msnw follow this DIY
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
Look in the trunk, there is cover for the brake light, remove and you will have access to change the bulb.
3.5 Liters