Diagnostic software

Is there any free OBD2 software out there that can change some of the factory settings?
TIA

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obdII management software to change auto computer parameters
http://www.popularmechanics.com/how_to_central/automotive/1302786.html
they "discuss" reprogramming the car but leave it up to the user to locate the information from the sources given. Also requires a pass through device which is kinda pricey, but might be easy for a home electronics project.
hth
Peter
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