OBD (OBD-II) Scantools
With the use of the right software, these OBD scantools are far more useful than just reading the CEL error code. It is a complete advance diagnostic tool that will look at most or even all of the functions of the car. It is a very handy tuning tool or just something cool to show your friends. Here are some of the readings that you can derive from it:
Read diagnostic trouble codes, both generic and manufacturer-specific, and display their meaning (over 3000 generic code definitions in the database).
Clear trouble codes and turn off the MIL ("Check Engine" light)
Display current sensor data, including:
Engine RPM
Calculated Load Value
Coolant Temperature
Fuel System Status
Vehicle Speed
Short Term Fuel Trim
Long Term Fuel Trim
Intake Manifold Pressure
Timing Advance
Intake Air Temperature
Air Flow Rate
Absolute Throttle Position
Oxygen sensor voltages/associated short term fuel trims
Fuel System status
Fuel Pressure
Freeze Frame data
Continuous and Non-Continuous Oxygen Sensor test results
Data graphing and logging