Porsche 911 Carrera - Manual (Page 254)

Filter
Air lter
A dirty air filter not only reduces engine perform-
ance, but can lead to premature engine wear.
Regular filter replacement is part of the routine
maintenance service.
In dusty conditions, check the filter element
more frequently and replace if necessary.
Combination lter
The fresh air passing through the combination filter
into the passenger compartment is virtually free of
dust, pollen, and unpleasant odors.
If the outside air is polluted by exhaust fumes,
press the recirculating-air button.
A dirty filter can be the cause of reduced air flow:
Have filter replaced by your authorized
Porsche dealer.
Regular filter replacement is part of the routine
maintenance service.
252
Maintenance, Car Care