"Is the taxi here?"
Here is an answer! Basically вот is used for objects and здесь for places.
Because этот means this, and the original sentence does not have this word.
this is correct but also этот is referring to a masculine noun which would be incorrect. taxi is neutral. это такси means this taxi
To me it said: You used the wrong word. "Такси находится здесь?" What is "находится"? I haven't seen that one before.