Protech OBDII Engine Code Reader or Diagnostic ToolA great way to accurately identify car problems and avoid unnecessary or costly maintenance. This handy diagnostic tool plugs into the OBDII port of your car and displays the data from the engine system directly on the backlit 2. 4" colour LCD screen. See engine performance real time, quickly read and clear engine data trouble codes (DTC), turn off MIL light, perform an electrics cranking or charging test, check state emission monitor status, drive