1: Read diagnostic trouble codes, both generic and manufacturer-specific, and display their meaning (over 3000 generic code definitions in the database).
2: Clear trouble codes and turn off the MIL ('Check Engine' light)
3: Display current sensor data, including:
4: Engine RPM
5: Calculated Load Value
6: Coolant Temperature
7: Fuel System Status
8: Vehicle Speed
9: Short Term Fuel Trim
10: Long Term Fuel Trim
11: Intake Manifold Pressure
12: Timing Advance
13: Intake Air Temperature
14: Air Flow Rate