First, undo the MAF sensor plug
Undo circular clip on the air intake, use a 7mm socket or a screwdriver to do this
Now, release the air intake
Undo the four retaining clips
Carefully lift away the air filter box
Clean off any debris on the surface of the filter. Replace with new filter if heavily contaminated
Check air filter box for debris. Clean if required. Replace the air filter
Reassemble the air filter housing