Can bus is written in c language, no device besides the can bus system will be able to read it and interpret it, there is a company that sell the peugeot can bus system for around 2 thousand dollars, but don't bother, unles you are prepared to spend money on peugeot parts ie, sat nav, rain sensing wipers, alarms, and modifying any software, it would be a waste, my advice is to leave the system alone, if you start tampering with it you will regret it.
On the other hand if you find a cheap system that can interpret and reprogram at less than the peugeot system, that comes from a reputable source and not ebay, I would be interested, if it is cheap that is.
