When to replace your engine air filter

The engine air filter stops dust and grit from getting into the engine. A clogged one makes the engine work harder.

How often

A typical range is every 15,000 to 30,000 miles (24,000 to 48,000 km), or sooner if you drive on dusty or unpaved roads. It’s a good habit to have it looked at whenever you change the oil.

Signs it’s clogged

Weaker acceleration or a sluggish feel.
Worse fuel economy than before.
The filter looks dark and full of dirt when you hold it up to the light.
Rough idle or odd engine noises.

Easy to do yourself

On many cars the filter sits in a box held by clips. It takes a few minutes and needs no special tools. Make sure the new one is the exact part for your car.

Common questions

Is the engine air filter the same as the cabin filter?

No. The engine filter cleans the air going into the engine. The cabin filter cleans the air you breathe inside the car.

Will a new filter improve my mileage?

A very clogged filter can hurt performance, so replacing it can help. A mildly dirty one makes little difference.

General guidance, not professional advice. Intervals are typical ranges and vary by car, so check your owner’s manual and ask a qualified mechanic if you’re unsure.