What should be checked for that may not be apparent when the vehicle is turned off?

When a vehicle is turned off, certain issues can remain hidden until the vehicle is operational. Checking for leaks is crucial because many types of leaks—such as oil, coolant, or fuel—may not be easily noticeable when the engine is not running. For instance, a fuel leak might only become apparent when the engine is under pressure or when fuel is circulating. Similarly, coolant leaks might only be visible when the engine reaches operating temperature, and oil leaks often require the engine to be running to see the full effect.

Regularly inspecting for leaks, especially in areas like under the vehicle where puddles could form, is an essential part of vehicle maintenance. This proactive approach helps prevent more severe problems that could arise from unnoticed fluid loss, ensuring the vehicle operates safely and efficiently.