Leon 1.6 BCB Engine
The Engine cover above is held in place by 4 rubber plugs to remove it you must first unclip the pipe shown in fig 2.
This clip below also needs to be released.
Once thats done pull the engine cover from the back & lift it slightly
you should be able to see this plug connected to the engine oil filler cap, unplug it & then lift the cover away pulling from both front & back of the engine.
Once removed see in the photo the 11 screws that hold the air filter housing together.
This last picture shows the 4 rubber plugs that hold the engine cover in place.
hope this is of some help.