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What causes the water light comes on?
What Causes the Engine light to come on? on 2003 Toyota Echo

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Water Troubles?
I checked all the fluid levels and the reservoir was down about a liter and a half. I filled it with water as it would have lots of antifreeze in it for this time of the year.
Engine Troubles
I checked the Gas cap and it seems fine.
Where is the Mass Air Flow Sensor and how do I clean it.
(1) Answer
The mass airflow sensor will be located on the air intake. Find your air filter housing and follow it toward the engine. Usually about 6inches to a foot past it. Remove the the bolts holding in with a security (holllow) starhead. Clean with MAF cleaner from a parts store and reinstall. Losing the amount of coolant that you are, I would suggest looking for a leak somewhere. Get the check engine code read at a parts store for free and post that result.