What is a sign of engine overheating?

A temperature warning light or gauge reading higher than normal is a clear and direct indication of engine overheating. Vehicles are equipped with temperature sensors that monitor the engine's operating temperature, ensuring it stays within a specific range for optimal performance. When the engine overheats, these sensors trigger a warning light or display an abnormal gauge reading, alerting the driver to a potentially serious issue that may require immediate attention.

Recognizing engine overheating early is crucial, as prolonged exposure to high temperatures can cause significant damage to engine components, which can lead to costly repairs or engine failure.

The other options may indicate engine issues but are not as definitive for overheating. A decrease in engine performance can result from various problems, not solely from overheating. An increase in fuel consumption could signal maintenance needs or inefficiencies unrelated to temperature. Excessive exhaust smoke might indicate issues such as burning oil or fuel mixture problems but is not a primary sign of overheating.