What is a common indication of a dirty air cleaner?

A common indication of a dirty air cleaner is, indeed, the loss of power. When the air cleaner is obstructed by dirt and debris, it restricts the airflow into the engine. This is critical since engines require a correct air-fuel mixture for optimal performance. If the engine is not receiving enough air, it cannot efficiently burn fuel, leading to a loss of power during acceleration and overall performance.

While increased fuel consumption and other issues could arise from various engine problems, loss of power is a more direct, immediate consequence of insufficient air intake due to a dirty air cleaner. Therefore, noticing a decrease in power output when driving can signal the need for an inspection and possible replacement of the air cleaner.