Why is replacing the air filter included in the inspection process?

• A. To maintain engine performance by ensuring clean air intake
• B. To decrease exhaust emissions to zero
• C. To prevent wheel shimmy
• D. To extend transmission life

Answer: (A)

Air entering the engine must be clean and at the right rate for proper combustion. The air filter’s job is to remove dust and debris from that incoming air. Replacing it during inspection ensures the engine can breathe freely, delivering consistent airflow, which supports good throttle response, power, and fuel efficiency. A clogged filter restricts airflow, which can lead to a less efficient or unstable air-fuel mixture and reduced performance over time. The other options don’t fit because zero-emission results aren’t guaranteed by a clean filter, wheel shimmy isn’t affected by the intake air, and transmission life depends on transmission components and fluid, not the air intake.