Driving with dirty or clogged filters can subtly or dramatically affect your car’s performance. You might notice reduced acceleration, poor fuel economy, unusual engine noises, smoke from the exhaust, or difficulty heating/cooling the cabin. Clogged filters force the engine or HVAC system to work harder, making the car feel sluggish, less responsive, and less efficient. While it may not always be immediately dangerous, neglecting filters can lead to long-term engine or system damage.