Yeah..one of the Kids here took it a step further and sold the idea on ebay ...I made several and sent them out to members for free, but when they started marketing them for sale , I let it go ...you can build it pretty easy for a couple of bucks and it is a cool tool for the DIYer.
The tool advantage is you can get to the Main modules ..whereas the built-in one only gets you Emmissions related codes that activate the CE lamp. ...not much help on the intricate systems, such as ASR, etc....

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A Dalton