For carbureted models, the air filter and PCV filter (if equipped) should be replaced at specified intervals. The air filter is positioned on top of the carbie and can be changed by unscrewing the wing nut, disconnecting the clips, and removing the cover. However, when doing this it is important to ensure that nothing falls into the carburetor or air cleaner assemblies. Take out the old air filter element and wipe the inside of the air cleaner housing. Properly mount a new filter in its housing. If there is one, remove and replace it with a PCV valve located within an enclosed area within the house of an air cleaner. Reinstalling the top plate as well as any disconnected hoses without overtightening wing nut is essential. For fuel-injected models, the air filter element should be replaced at specified intervals. The right inner fender panel has got an attachment for its housing on which there is an air filter. Loosen screw clamp securing hose to intake duct and disconnect hose from cover of air cleaner element. Air flow sensor's electrical connector will then need to be unplugged from it. Releasing and taking off of an air filter cover brings about lifting out of its element from a case unit with subsequent wiping clean of such casing unit; note that this process might differ when considering various car models though their engines are equipped with filters enabling easy repair works during removal and installation procedures that helps in saving ones time since all you have to do is unscrew two bolts holding these components together giving way enough space around which means no other tools needed except those required during filtering systems' maintenance services where technicians sometimes need some special toolkits depending upon vehicle type only if told otherwise by experts dealing specifically with particular brand such as BMW cars used mostly worldwide under supervision trained mechanics always make sure they perform smoothly while executing their tasks since they are highly sensitive so anything seems out place could lead catastrophic results, resulting serious damage caused e. Depending on the make and model, this process may be done differently. New filter element should be properly placed in the housing. Put on cover; then tighten it down, reconnect the air intake hose securely and plug in electrical connector at rear side of mass airflow sensor.