Which of the following is a common method for reducing vehicle emissions?

Regular engine tuning and repairs are a crucial method for reducing vehicle emissions. Well-maintained engines operate more efficiently, leading to better fuel combustion. This efficiency minimizes the release of harmful byproducts that contribute to air pollution. Engine tuning ensures that components such as the air-fuel mixture, spark plugs, and ignition timing are optimal, which directly impacts the emissions produced during operation.

Regular maintenance can also address issues like leaks, faulty sensors, or clogged filters that negatively affect engine performance and increase emissions. By keeping the engine in good condition, not only are emissions reduced, but fuel economy can also improve, providing a more environmentally friendly vehicle operation while saving drivers money on fuel costs.