eBay has some cheap obd2 cable interfaces that plug into the cars ecu , threw the obd2 port and into the computer threw usb. There are many free programs and you should be able to find a fully featured free program, most of the free ones are crippled but not all.
I have the interface cable and the free edition of Vagcom on my laptop and another cd full of tuner files that work with most obd2 vehicles.
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