I am new here and just started to play with Arduino about 3 weeks ago. Since I have lots of expertise in software programming and some knowledge about micro-controllers, it's really quick for me to start developing useful things on the Arduino platform. I think Arduino is so wonderful invention for us software guys. I spent 2 weeks to make an Arduino board connect with my car through OBD-II port, reading out the data and displaying them on a 84x48 LCD shield. It's great fun! I wrote an article
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Would like some help interfacing Arduino with OBD2 computer on car - Project Guidance - Arduino Forum
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Would like some help interfacing Arduino with OBD2 computer on car - #20 by scottyjr - Project Guidance - Arduino Forum