You will need a TORX E14 socket.
1. Disconnect the air supply hose from the air filter...
2....and the car body, remove the sleeve.
3. Turn out three bolts of fastening of the air filter.
4. Turn out the last fastening bolt located behind on the right.
5. Hold the throttle assembly and lift up on the air filter to separate them.
6. Raise the air filter, disconnect the crankcase ventilation hose from its branch pipe and remove the air filter.
7. Install the parts in the reverse order of removal.