Air Filter Replacement
What is an air filter?
In order to run, the engine needs a precise mixture of fuel and air. When outside air is drawn into the engine, the air filter prevents harmful dirt and debris from entering the system.
How does the air filter work?
Typically made of paper or foam suspended in a plastic frame, the air filter media catches the dirt and debris that comes in through the air intake.
What are the symptoms related to a bad air filter?
The filter will become dirty, but drivability problems are not typically noticed except in the extreme. Decreased fuel efficiency, stumbling, or rough running may be noted with a severely clogged air filter.
Can I drive with an air filter problem?
Because the filter clogs over time, the effects of a dirty filter will not be noticeable except with severe service conditions, such as consistent driving in a dusty or off-road area.
How often do air filters need to be replaced?
Replacement frequency of the air filter will vary by vehicle and driving conditions. We typically see the engine air filter replaced at approximately 40,000 miles
How are air filter issues diagnosed?
A visual inspection of the filter will be sufficient. The technician will open the air filter box and remove the filter. The airbox will be inspected for road debris, and the filter will be assessed for cleanliness.
How is an air filter replaced?
The procedure is the same as the inspection. The technician will open the air filter box and remove the filter. Typically the filter is a cartridge that can simply be swapped for a new one. Some high end cars may have two filters in two air boxes that need to be changed at the same time.
RepairPal Recommendations for air filter issues
Most engine air filters are very low cost, when going through the trouble to inspect them, they should be replaced unless they have been recently serviced.
What to look out for when dealing with air filter issues
The air filter box cover is attached to the engine intake tube. Often, this tube will hold additional sensors such as the Mass Airflow Sensor (MAF) or intake air temperature sensor. When servicing this part, it is important not to disconnect or damage anything in the vicinity. There may also be vacuum hoses in the servicing area. Failure to take care or reconnect lines and hoses in this area may cause running issues and the Check Engine Light to illuminate.
Can I replace the air filter myself?
Most engine air filters are extremely easy to replace. But before ordering parts or attempting this service yourself, it is important to look for the correct procedures to replace the engine air filter on your specific car. Certain models will require tools in order to access the air filter box as today's engine bays become more complicated and crowded.