What does the check engine light typically indicate?

The check engine light typically indicates a potential problem with the engine or emissions system. This light serves as a crucial alert for drivers that the vehicle's onboard diagnostic system has detected an issue that could affect the engine's performance or increase emissions beyond acceptable levels. The issues can range from minor problems, such as a loose gas cap, to more serious concerns like a malfunctioning oxygen sensor or catalytic converter.

When the light activates, it's important for the driver to have the vehicle scanned for diagnostic trouble codes (DTCs) using an OBD-II scanner. This helps identify the specific cause triggering the light. Addressing these issues promptly is important not only for maintaining vehicle performance but also for ensuring compliance with environmental regulations regarding emissions.

The other options relate to different vehicle systems or maintenance needs; for example, low tire pressure would trigger a different warning light, and the need for an oil change is also indicated through separate maintenance alerts rather than a check engine signal.