Real-time parameters: RPM, speed, pedal position, spark advance, airflow rate, coolant temperature, etc.
Status of “Check Engine” light
Emission readiness status
Freeze frame: a “snapshot” of parameters at the time a trouble event has occurred.
Diagnostic trouble codes (DTCs).
Oxygen sensor test results
Vehicle Identification Number (VIN)
Number of ignition cycles
Professional car repair
Number of miles driven with MIL on