How to Remove Mercedes C300 W204 Air Filter Housing

1. Open the hood of the car. Grasp the sides of the smaller engine cover in the front of the engine compartment and pull up to disengage the clips. Work around all four edges to release the cover, then set it aside.
2. Disconnect the air hose running to the rear engine cover. Pull up on the cover, working around all four edges. Turn the cover upside down to access the two engine air filters.
3. Pull the air filters out of the mounting area. Slide the replacement filters into place. Push the rear engine cover into place until the clips lock. Align the front engine cover and press it into place.