Modern vehicles have an OBD - On Board Diagnostic Interface, a standard interface to the vehicle, about the error and status messages can retrieve from the control appliances. With suitably programmed microcontrollers can be relatively easy to build an interface to query with their own laptop or PC these messages. There are also a number of programs on the Internet, for example, OBD Diag

Here you will find Schematic Circuit Diagram for DIY and further information on OBD OBD2
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OBD-yourself

www.loetstelle.net/projekte/obd/obd.php