How can live data from a scan tool assist in diagnosing engine performance problems, and what are key parameters to monitor?

How can live data from a scan tool assist in diagnosing engine performance problems, and what are key parameters to monitor?

• A. Provides static fault codes only.
• B. Records data after a fault occurs.
• C. Provides real-time sensor data to identify anomalies; monitor MAF, MAP, O2 sensors, fuel trims, RPM, ignition timing, coolant temp, injector pulse width, misfire counters.
• D. Is only used for vehicle speed calculation.

Answer: (C)