The primary function of an engine air filter is to protect the engine by preventing harmful particles from entering the combustion chamber. 

The filter, typically made of pleated paper or synthetic material, traps these particles as air passes through it. 

Clean air is crucial for efficient combustion and optimal engine performance. A clogged air filter can restrict airflow, leading to reduced engine power, poor fuel economy, and potential engine damage. 

Engine air filters are usually located under the hood in the engine compartment, often in a plastic housing near the air intake. 

Engine air filters need to be replaced regularly, as recommended in your vehicle’s owner’s manual, to maintain optimal engine performance.