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There is an access panel in the trunk, pull back the cover in the trunk and its easy from there.
you pull out the fram around the cluster then there are 2 screws you unscrew them and unhook from the wiring harness
either pull the cylinder head off, or pull a plug and look into the cylinder with a boroscope.
To remove the back seat cushion of a Toyota Echo (any year) simply grasp the seat between the cushion and body of the car and give it a good hard pull straight up. You will have to do this once on each side then again for the middle back of the cushion.
Pull the knobs of the air conditioning off, then unscrew panel (using a plus-head screwdriver). You have a three wired plug-in's that's attached to the back of the console (you might need a flat-head screwdriver to unclip them) that need to be removed. I think that you'll also have to unplug the cigarette lighter from the console too. The whole thing takes about five minutes to remove the console from the Echo.
Full instructions can be found here: http://wwww.gordosoft.com/echo/How-to-change-post-cat-O2-sensor-Toyota-Echo.pdf (NOTE: This was online but I can't seem to pull it up now so I'm sharing a copy I made, its an excellent tutorial)
Depends on which lights. Pull off the climate control knobs and take out both screws. Give the dash a tug from the sides near the compartments and you can pull the whole thing out.
To replace your brake light, you need to unscrew the brake cover from the inside of the trunk. Then you will be able to pull the old bulb out and replace it.
Open the glove compartment, gently squeeze in on both sides of the open compartment, then you can pull the whole glove box out. The air filter is behind there.
Pull the old one out and put a new one in its place. You may need a tool that is usually located in the fuse panel to remove the old fuse.
Just look at it. Uncrew the one bracket that holds it in place, and unscrew the two wires attached to it, pull the old one out and plop the new one in. Simple.
Have a helper pull and hold the hood release lever, then use a pry bar to lift the hood enough to get your fingers in to unlatch the release at the front of the hood.