What does the Check Engine light signify in relation to emissions?

The Check Engine light serves as an important indicator of vehicle health, particularly concerning the emissions system. When this light illuminates, it typically signifies that the vehicle's onboard diagnostic system has detected an issue that may lead to increased emissions or affect the efficiency of the emissions control system. This could involve a range of problems, from minor sensor malfunctions to more severe issues like exhaust leaks or catalyst failures. Addressing the problems indicated by the Check Engine light can help in reducing harmful emissions, ensuring that the vehicle complies with environmental regulations and operates optimally.

Other options do not accurately reflect the purpose of the Check Engine light. Enhancements in vehicle performance and indicators of good condition relate to overall vehicle health rather than specific emissions issues. Similarly, it does not indicate a need for an oil change, as that is typically linked to maintenance schedules and is not directly related to the emissions control system.