What is a common sign of a failing car battery?

A common sign of a failing car battery is difficulty starting the engine or dim lights. When a battery begins to fail, it may not hold a charge effectively, leading to issues such as slow engine cranking during startup. This is often accompanied by dimming headlights or dashboard lights, as the battery struggles to provide sufficient power to the vehicle's electrical systems.

In contrast, engine overheating usually relates to issues with the cooling system or engine components, while a high-pitched noise while driving often indicates a problem with the belts or pulleys, unrelated to battery performance. Excessive fuel consumption can signify a variety of fuel system issues or engine performance problems, but it does not directly link to battery failure. Thus, the symptoms of difficulty starting and dim lights are clear indicators of battery issues, highlighting the importance of battery health in vehicle operation.