Engine air filters are mounted in the air intake system to catch dirt and other particles that could damage internal engine parts.

They’re usually made of paper (some are made of cotton or other materials) and should be replaced according to your manufacturer’s maintenance schedule.

A dirty or clogged air filter will restrict air going into the engine.

This leads to a restriction in the amount of fuel injected.

The main result is a loss of acceleration, with minimal impact on fuel economy.

Regularly changing the air filter is an inexpensive way to extend the life of an engine. Small particles of dust or sand can cause damage to internal parts such as pistons and cylinders.