Your car has two air filters: the engine air filter and the cabin (pollen) filter. Both need periodic replacement and both affect performance or comfort when neglected.
Engine air filter
The engine air filter removes dust, pollen, insects and other particles from the air before it enters the combustion chamber. A clean filter allows the engine to breathe freely. A blocked filter restricts airflow, which reduces power and fuel economy, and in severe cases can cause the air/fuel mixture to run rich, increasing emissions and accelerating wear on internal components.
Replacement interval: typically every 20,000 to 30,000 miles or every 2 to 3 years, whichever comes first. Check your vehicle handbook for the specific interval. Driving in dusty environments (gravel roads, farmland, heavy urban pollution) shortens the interval.
Cabin (pollen) filter
The cabin filter cleans the air coming into the passenger compartment through the heating, ventilation and air conditioning system. A blocked cabin filter reduces airflow from the heater and air conditioning vents, can cause musty smells inside the car, and reduces the effectiveness of the air conditioning system. Allergy sufferers notice the difference particularly when the filter is changed.
Replacement interval: typically every 12 to 15,000 miles or every year, whichever comes first. This is a standard inclusion in a full service.
Can you check filters yourself
The engine air filter is usually accessible without tools. Open the bonnet, locate the black plastic air filter housing (often connected to a large intake duct), unclip it, and pull out the filter element. Hold it up to a light source. If it is grey or brown rather than white or light cream, it is due for replacement. The cabin filter is usually behind the glove box or under the dashboard and is less accessible.
Both filters are replaced as part of our full service. Book a service online or call 0131 554 3423.