Replacing your engine air filter is a quick, low-cost maintenance job that helps your engine breathe properly and run efficiently.
New engine air filter (correct for your car model)
Screwdriver or socket (if the airbox is screwed shut)
Clean cloth (optional)
Open the bonnet.
Look for a black plastic box connected to a large air intake hose.
This is the airbox, usually on one side of the engine bay.
Depending on the car, it may be:
Clips that unhook by hand, or
Screws that need a screwdriver/socket
Undo the fasteners and carefully lift the lid.
Take out the filter from inside the airbox.
Note how it sits (orientation matters in some designs).
Check for dirt, leaves, or debris inside the housing.
Wipe out dust or debris with a clean cloth.
Make sure nothing falls into the intake tube.
Place the new filter in the same orientation as the old one.
Ensure it sits flat and seals properly around the edges.
Refit the lid.
Secure all clips or screws tightly so the box is fully sealed.
A poorly sealed airbox can let unfiltered air into the engine.
Make sure nothing is left loose in the engine bay.
Start the engine and ensure everything runs normally (it should sound unchanged).
Replace the air filter every 12,000–20,000 miles (or as your manual recommends).
More frequent replacement may be needed in dusty or urban environments.
A clogged air filter can reduce fuel efficiency and engine performance.
Always make sure the engine is off and cool before working.
Don’t drop dirt into the air intake while the airbox is open.
Ensure all clips and screws are properly secured before driving.