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Look in the trunk, there is a cover over the light assembly - open and you will have access to change the light.
Yes
$250-300
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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You wait until it falls off on its own.
On top of the engine, but you have to remove the cover to see them.
How to open hood on Toyota echo
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