I just got a vagcom shareware version. I got it to reset CEL and read codes. Its spitting out a code for my 02's. The thing is that I have no idea how to diagnose a problem with the vag. Specifically, how do you know the limits that a specific measuring block like the O2 block should stay in. The 02 blocks output is in %. How much is too much or too little. Is there a site that has this info. Does the registered version have this info.