In Ford vehicles, the check engine light is a critical signal from the onboard diagnostic system indicating potential issues within the engine, emission controls, or sensor functionality. This indicator, often triggered by loose fuel caps, faulty oxygen sensors, or misfires, prioritizes data by generating specific trouble codes that pinpoint the source of the problem. By leveraging Ford's advanced diagnostic technology, technicians can access real-time performance data, enabling precise troubleshooting and timely repairs to maintain optimal vehicle performance and safety.